Difference between revisions of "Monster Generation"
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Each monster has a minimum dlevel, a maximum dlevel, a weight, and a danger rating. Minimum level and maximum level determine whether the monster can appear on a floor at all. Weight indicates relative likelihood of appearing. Danger indicates (inversely) how many can be generated. | Each monster has a minimum dlevel, a maximum dlevel, a weight, and a danger rating. Minimum level and maximum level determine whether the monster can appear on a floor at all. Weight indicates relative likelihood of appearing. Danger indicates (inversely) how many can be generated. | ||
| − | + | The displayed minimum level is valid for ITYTD and HNTR, and it is lower at higher difficulties (-3 for HMP and -6 for UV/N!), which means that tougher monsters start appearing earlier in the game. Other values are unaffected by difficulty. | |
| + | |||
| + | For all enemies that can normally spawn, here are the values. | ||
{| style="rules: cols; border: 2px solid darkred; border-spacing: 0; font-size: 90%; margin: 0.25em 0.5em; text-align: right" | {| style="rules: cols; border: 2px solid darkred; border-spacing: 0; font-size: 90%; margin: 0.25em 0.5em; text-align: right" | ||
|colspan=5 style="background: darkred; color: yellow; font-size: 120%; text-align: center"|'''Monster Generation Parameters''' | |colspan=5 style="background: darkred; color: yellow; font-size: 120%; text-align: center"|'''Monster Generation Parameters''' | ||
| Line 13: | Line 15: | ||
|style="text-align: left; padding-left: 1ex"|'''Danger''' | |style="text-align: left; padding-left: 1ex"|'''Danger''' | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"|Former | + | |style="text-align: left"|[[Former human]] |
|0 | |0 | ||
| − | |12 | + | |12{{Rollover|*|Can continue to spawn indefinitely after this point in monster groups and certain level types.|?}} |
|10 | |10 | ||
|1 | |1 | ||
|- | |- | ||
| − | |style="text-align: left"|Former | + | |style="text-align: left"|[[Former sergeant]] |
|2 | |2 | ||
| − | |15 | + | |15{{Rollover|*|Can continue to spawn indefinitely after this point in monster groups and certain level types.|?}} |
|10 | |10 | ||
|2 | |2 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"|Former | + | |style="text-align: left"|[[Former captain]] |
| − | | | + | |5 |
| − | |15 | + | |15{{Rollover|*|Can continue to spawn indefinitely after this point in monster groups and certain level types.|?}} |
|10 | |10 | ||
|3 | |3 | ||
|- | |- | ||
| − | |style="text-align: left"|Imp | + | |style="text-align: left"|[[Imp]] |
|0 | |0 | ||
|17 | |17 | ||
| Line 37: | Line 39: | ||
|2 | |2 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"|Demon | + | |style="text-align: left"|[[Demon]] |
|4 | |4 | ||
| − | |20 | + | |20{{Rollover|*|Can continue to spawn up to floor 60 in caves.|?}} |
|6 | |6 | ||
|4 | |4 | ||
|- | |- | ||
| − | |style="text-align: left"|Lost | + | |style="text-align: left"|[[Lost soul]] |
| − | |6 | + | |6{{Rollover|*|Can spawn earlier than this below HMP in caves.|?}} |
| − | |16 | + | |16{{Rollover|*|Can continue to spawn indefinitely after this point in caves and from Pain Elementals.|?}} |
|10 | |10 | ||
|3 | |3 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"|Hell | + | |style="text-align: left"|[[Hell knight]] |
|9 | |9 | ||
| − | |15 | + | |15{{Rollover|*|Can continue to spawn indefinitely after this point in monster groups and certain level types.|?}} |
|6 | |6 | ||
|6 | |6 | ||
|- | |- | ||
| − | |style="text-align: left"|Cacodemon | + | |style="text-align: left"|[[Cacodemon]] |
| − | |10 | + | |10{{Rollover|*|Can spawn in vaults as early as floor 1 on UV/N!, and can spawn on floor 3 in caves on N!.|?}} |
| − | |50 | + | |50{{Rollover|*|Can continue to spawn up to floor 100 in caves, and indefinitely after this point in vaults and monster groups.|?}} |
|6 | |6 | ||
|6 | |6 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"| | + | |style="text-align: left"|[[Pain elemental]] |
| − | | | + | |10 |
| − | | | + | |40{{Rollover|*|Can continue to spawn indefinitely after this point in caves and monster groups.|?}} |
| + | |4 | ||
|6 | |6 | ||
| − | |||
|- | |- | ||
| − | |style="text-align: left"| | + | |style="text-align: left"|[[Former commando]] |
|12 | |12 | ||
| − | | | + | |21{{Rollover|*|Can continue to spawn after this point in certain level types.|?}} |
| − | | | + | |
|6 | |6 | ||
| + | |7 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"|Baron of | + | |style="text-align: left"|[[Baron of hell]] |
|12 | |12 | ||
|N/A | |N/A | ||
| Line 79: | Line 81: | ||
|10 | |10 | ||
|- | |- | ||
| − | |style="text-align: left"|Arachnotron | + | |style="text-align: left"|[[Arachnotron]] |
| − | |13 | + | |13{{Rollover|*|Can spawn as soon as floor 6 in caves on N!|?}} |
| − | |50 | + | |50{{Rollover|*|Can continue to spawn up to floor 80 in caves, and indefinitely in monster groups.|?}} |
|4 | |4 | ||
|9 | |9 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"|Revenant | + | |style="text-align: left"|[[Revenant]] |
|13 | |13 | ||
|N/A | |N/A | ||
| Line 91: | Line 93: | ||
|12 | |12 | ||
|- | |- | ||
| − | |style="text-align: left"|Mancubus | + | |style="text-align: left"|[[Mancubus]] |
|15 | |15 | ||
|N/A | |N/A | ||
| Line 97: | Line 99: | ||
|12 | |12 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"|Arch-vile | + | |style="text-align: left"|[[Arch-vile]] |
|16 | |16 | ||
|N/A | |N/A | ||
| Line 103: | Line 105: | ||
|14 | |14 | ||
|- | |- | ||
| − | |style="text-align: left"|Nightmare | + | |style="text-align: left"|[[Nightmare imp]] |
| − | |30 | + | |30{{Rollover|*|Can spawn earlier than this in vaults on UV/N!.|?}} |
| − | |60 | + | |60{{Rollover|*|Can continue to spawn indefinitely after this point in monster groups.|?}} |
|8 | |8 | ||
|6 | |6 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"|Nightmare | + | |style="text-align: left"|[[Nightmare soul]] |
| + | |30{{Rollover|*|Does not naturally spawn by itself, but will start spawning in monster groups at this depth.|?}} | ||
| + | |N/A | ||
| + | |0 | ||
| + | |4 | ||
| + | |- | ||
| + | |style="text-align: left"|[[Elite former human]] | ||
|40 | |40 | ||
| + | |80{{Rollover|*|Can continue to spawn indefinitely after this point in monster groups.|?}} | ||
| + | |4 | ||
| + | |6 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|[[Nightmare demon]] | ||
| + | |40{{Rollover|*|Can start spawning in monster groups at floor 35, and even earlier in caves and vaults on UV/N!.|?}} | ||
|N/A | |N/A | ||
|6 | |6 | ||
| − | | | + | |8 |
|- | |- | ||
| − | |style="text-align: left"| | + | |style="text-align: left"|[[Bruiser brother]] |
| − | | | + | |40{{Rollover|*|Can possibly spawn much earlier than this in the Hell Noble-only levels, even in standard game depths.|?}} |
|N/A | |N/A | ||
|6 | |6 | ||
| − | | | + | |14 |
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"|Nightmare | + | |style="text-align: left"|[[Nightmare knight]] |
| − | |50 | + | |41 |
| + | |N/A | ||
| + | |6 | ||
| + | |12 | ||
| + | |- | ||
| + | |style="text-align: left"|[[Nightmare arachnotron]] | ||
| + | |50{{Rollover|*|Can start spawning as early as floor 40 in caves.|?}} | ||
|N/A | |N/A | ||
|4 | |4 | ||
|12 | |12 | ||
| − | |- | + | |- style="background: #333;" |
| − | |style="text-align: left"|Nightmare | + | |style="text-align: left"|[[Nightmare cacodemon]] |
| − | | | + | |51{{Rollover|*|Can spawn earlier than this in caves and vaults, especially on harder difficulties.|?}} |
|N/A | |N/A | ||
| + | |6 | ||
| + | |10 | ||
| + | |- | ||
| + | |style="text-align: left"|[[Elite former sergeant]] | ||
| + | |60 | ||
| + | |90{{Rollover|*|Can continue to spawn indefinitely after this point in monster groups.|?}} | ||
|3 | |3 | ||
| − | | | + | |8 |
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"| | + | |style="text-align: left"|[[Shambler]] |
| − | |50 | + | |60{{Rollover|*|Can possibly spawn as early as floor 50 in rare Shambler-only levels on HMP+.|?}} |
|N/A | |N/A | ||
| − | | | + | |3 |
|14 | |14 | ||
| − | |- | + | |- |
| − | |style="text-align: left"|Lava | + | |style="text-align: left"|[[Nightmare revenant]] |
| + | |60 | ||
| + | |N/A | ||
| + | |6 | ||
| + | |15 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|[[Elite former captain]] | ||
| + | |70 | ||
| + | |N/A | ||
| + | |3 | ||
| + | |10 | ||
| + | |- | ||
| + | |style="text-align: left"|[[Nightmare elemental]] | ||
| + | |70{{Rollover|*|Can start spawning in monster groups at floor 60, and even earlier in caves at floor 50.|?}} | ||
| + | |N/A | ||
| + | |3 | ||
| + | |16 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|[[Lava elemental]] | ||
|70 | |70 | ||
|N/A | |N/A | ||
|1 | |1 | ||
|16 | |16 | ||
| + | |- | ||
| + | |style="text-align: left"|[[Cyberdemon]] | ||
| + | |70{{Rollover|*|Can possibly spawn as early as floor 50 in rare Cyberdemon-only levels on HMP+.|?}} | ||
| + | |N/A | ||
| + | |1 | ||
| + | |30 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"| | + | |style="text-align: left"|[[Nightmare mancubus]] |
| − | | | + | |75 |
|N/A | |N/A | ||
| − | | | + | |4 |
| + | |15 | ||
| + | |- | ||
| + | |style="text-align: left"|[[Elite former commando]] | ||
| + | |80{{Rollover|*|Can start spawning in monster groups at floor 70.|?}} | ||
| + | |N/A | ||
| + | |2 | ||
|14 | |14 | ||
| − | |- | + | |- style="background: #333;" |
| − | |style="text-align: left"|Agony | + | |style="text-align: left"|[[Agony elemental]] |
| − | |80 | + | |80{{Rollover|*|Can possibly spawn in caves as early as floor 50 on HMP+ difficulty.|?}} |
|N/A | |N/A | ||
|1 | |1 | ||
|20 | |20 | ||
| − | |- | + | |- |
| − | |style="text-align: left"| | + | |style="text-align: left"|[[Nightmare arch-vile]] |
|80 | |80 | ||
|N/A | |N/A | ||
| − | | | + | |3 |
| − | | | + | |20 |
|} | |} | ||
| Line 189: | Line 245: | ||
|10 | |10 | ||
|- | |- | ||
| − | |style="text-align: left"| | + | |style="text-align: left"|4-9 × demon |
| − | + | ||
| − | + | ||
|10 | |10 | ||
| + | |22 | ||
| + | |4 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"|1 × | + | |style="text-align: left"|1 × baron of hell, 4-9 × imp |
| − | | | + | |13 |
|21 | |21 | ||
|10 | |10 | ||
| Line 201: | Line 257: | ||
|style="text-align: left"|1 × pain elemental, 3-8 × lost soul | |style="text-align: left"|1 × pain elemental, 3-8 × lost soul | ||
|13 | |13 | ||
| − | | | + | |25 |
|8 | |8 | ||
|- style="background: #333;" | |- style="background: #333;" | ||
| − | |style="text-align: left"| | + | |style="text-align: left"|1 × former commando, 2-6 × former sergeant |
| + | |15 | ||
| + | |21 | ||
|10 | |10 | ||
| − | |||
| − | |||
|- | |- | ||
|style="text-align: left"|1 × baron of hell, 2-4 × hell knight | |style="text-align: left"|1 × baron of hell, 2-4 × hell knight | ||
| Line 250: | Line 306: | ||
|} | |} | ||
| − | + | The following monster groups will only appear in deeper levels of [[Angel of 100]] and [[Archangel of 666]]: | |
| − | + | {|style="rules: cols; border: 2px solid darkred; border-spacing: 0; font-size: 90%; margin: 0.25em 0.5em; text-align: right" | |
| − | + | |colspan=4 style="background: darkred; color: yellow; font-size: 120%; text-align: center"|'''A100-exclusive Monster Groups''' | |
| − | + | ||
| − | |''' | + | |
|- | |- | ||
| − | | | + | |style="text-align: left"|'''Monsters''' |
| − | |style="text-align: | + | |style="text-align: left; padding-left: 1ex"|'''Minimum''' |
| + | |style="text-align: left; padding-left: 1ex"|'''Maximum''' | ||
| + | |style="text-align: left; padding-left: 1ex"|'''Weight''' | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|4-9 × nightmare soul | ||
| + | |30 | ||
| + | |59 | ||
| + | |4 | ||
|- | |- | ||
| − | | | + | |style="text-align: left"|2 × baron of hell, 2-6 × nightmare imp |
| − | |style="text-align: | + | |30 |
| + | |59 | ||
| + | |4 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|2 × pain elemental, 2-5 × cacodemon | ||
| + | |30 | ||
| + | |N/A | ||
| + | |4 | ||
|- | |- | ||
| − | | | + | |style="text-align: left"|3-5 × nightmare demon |
| − | |style="text-align: | + | |35 |
| + | |49 | ||
| + | |4 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|4-8 × nightmare demon | ||
| + | |50 | ||
| + | |N/A | ||
| + | |4 | ||
|- | |- | ||
| − | | | + | |style="text-align: left"|2 × nightmare knight, 4-8 × nightmare imp |
| − | |style="text-align: | + | |60 |
| + | |N/A | ||
| + | |4 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|2 × nightmare elemental, 4-6 × nightmare soul | ||
| + | |60 | ||
| + | |N/A | ||
| + | |4 | ||
|- | |- | ||
| − | | | + | |style="text-align: left"|2 × nightmare knight, 2-3 × elite former captain, 2-3 × elite former sergeant |
| − | |style="text-align: | + | |70 |
| + | |N/A | ||
| + | |3 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|1 × elite former commando, 2-3 × elite former captain, 2-3 × elite former sergeant | ||
| + | |70 | ||
| + | |N/A | ||
| + | |2 | ||
| + | |- | ||
| + | |style="text-align: left"|3-6 × nightmare arachnotron | ||
| + | |70 | ||
| + | |N/A | ||
| + | |2 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|1-3 × lava elemental, 2-3 × shambler | ||
| + | |75 | ||
| + | |N/A | ||
| + | |1 | ||
| + | |- | ||
| + | |style="text-align: left"|1 × cyberdemon, 4-8 × baron of hell | ||
| + | |80 | ||
| + | |N/A | ||
| + | |2 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|1 × agony elemental, 3-8 × nightmare cacodemon | ||
| + | |85 | ||
| + | |N/A | ||
| + | |2 | ||
| + | |- | ||
| + | |style="text-align: left"|1 × nightmare arch-vile, 2-3 × elite former captain, 2-3 × elite former sergeant, 3-6 × elite former human | ||
| + | |90 | ||
| + | |N/A | ||
| + | |2 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|1 × cyberdemon, 3-6 × bruiser brother | ||
| + | |90 | ||
| + | |N/A | ||
| + | |1 | ||
| + | |- | ||
| + | |style="text-align: left"|2-4 × nightmare mancubus | ||
| + | |95 | ||
| + | |149 | ||
| + | |2 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|2-4 × nightmare revenant | ||
| + | |95 | ||
| + | |149 | ||
| + | |2 | ||
| + | |- | ||
| + | |style="text-align: left"|2 × nightmare arch-vile, 2-4 × nightmare mancubus, 2-4 × nightmare revenant | ||
| + | |100 | ||
| + | |N/A | ||
| + | |2 | ||
| + | |- style="background: #333;" | ||
| + | |style="text-align: left"|2 × nightmare arch-vile, 2-5 × nightmare mancubus | ||
| + | |150 | ||
| + | |N/A | ||
| + | |2 | ||
| + | |- | ||
| + | |style="text-align: left"|2 × nightmare arch-vile, 2-5 × nightmare revenant | ||
| + | |150 | ||
| + | |N/A | ||
| + | |2 | ||
|} | |} | ||
| + | |||
| + | Notice that monster groups are the only way for some enemies to appear on very deep levels. | ||
Each level is given a total danger rating depending on depth and difficulty level. Monster placement usually proceeds as follows: while the total danger of enemies placed so far is less than the danger rating of the level, pick a new monster or monster group and add it (entirely) to the level. Picking a monster or group is done using the weights as relative probabilities for all the monsters and groups with a valid dlevel range. When a monster group is picked, all its ranges are resolved uniformly and independently. Each monster is added to a random empty tile; for monster groups, each monster is added separately. | Each level is given a total danger rating depending on depth and difficulty level. Monster placement usually proceeds as follows: while the total danger of enemies placed so far is less than the danger rating of the level, pick a new monster or monster group and add it (entirely) to the level. Picking a monster or group is done using the weights as relative probabilities for all the monsters and groups with a valid dlevel range. When a monster group is picked, all its ranges are resolved uniformly and independently. Each monster is added to a random empty tile; for monster groups, each monster is added separately. | ||
Latest revision as of 04:26, 25 March 2026
| Technical | |
| This article discusses technical aspects of DoomRL and will be of limited interest to most players. | |
Each monster has a minimum dlevel, a maximum dlevel, a weight, and a danger rating. Minimum level and maximum level determine whether the monster can appear on a floor at all. Weight indicates relative likelihood of appearing. Danger indicates (inversely) how many can be generated.
The displayed minimum level is valid for ITYTD and HNTR, and it is lower at higher difficulties (-3 for HMP and -6 for UV/N!), which means that tougher monsters start appearing earlier in the game. Other values are unaffected by difficulty.
For all enemies that can normally spawn, here are the values.
| Monster Generation Parameters | ||||
| Monster | Minimum | Maximum | Weight | Danger |
| Former human | 0 | 12* | 10 | 1 |
| Former sergeant | 2 | 15* | 10 | 2 |
| Former captain | 5 | 15* | 10 | 3 |
| Imp | 0 | 17 | 8 | 2 |
| Demon | 4 | 20* | 6 | 4 |
| Lost soul | 6* | 16* | 10 | 3 |
| Hell knight | 9 | 15* | 6 | 6 |
| Cacodemon | 10* | 50* | 6 | 6 |
| Pain elemental | 10 | 40* | 4 | 6 |
| Former commando | 12 | 21* | 6 | 7 |
| Baron of hell | 12 | N/A | 6 | 10 |
| Arachnotron | 13* | 50* | 4 | 9 |
| Revenant | 13 | N/A | 5 | 12 |
| Mancubus | 15 | N/A | 7 | 12 |
| Arch-vile | 16 | N/A | 4 | 14 |
| Nightmare imp | 30* | 60* | 8 | 6 |
| Nightmare soul | 30* | N/A | 0 | 4 |
| Elite former human | 40 | 80* | 4 | 6 |
| Nightmare demon | 40* | N/A | 6 | 8 |
| Bruiser brother | 40* | N/A | 6 | 14 |
| Nightmare knight | 41 | N/A | 6 | 12 |
| Nightmare arachnotron | 50* | N/A | 4 | 12 |
| Nightmare cacodemon | 51* | N/A | 6 | 10 |
| Elite former sergeant | 60 | 90* | 3 | 8 |
| Shambler | 60* | N/A | 3 | 14 |
| Nightmare revenant | 60 | N/A | 6 | 15 |
| Elite former captain | 70 | N/A | 3 | 10 |
| Nightmare elemental | 70* | N/A | 3 | 16 |
| Lava elemental | 70 | N/A | 1 | 16 |
| Cyberdemon | 70* | N/A | 1 | 30 |
| Nightmare mancubus | 75 | N/A | 4 | 15 |
| Elite former commando | 80* | N/A | 2 | 14 |
| Agony elemental | 80* | N/A | 1 | 20 |
| Nightmare arch-vile | 80 | N/A | 3 | 20 |
Additionally, the are monster groups. Monsters groups have their own minimum and maximum levels and weights that are used instead of the values for the the individual monsters. The effective danger of a group is the sum of the dangers of its monsters.
| Monster Groups | |||
| Monsters | Minimum | Maximum | Weight |
| 1 × former sergeant, 2-6 × former human | 7 | 16 | 10 |
| 5-8 × imp | 5 | 8 | 10 |
| 1 × hell knight, 2-6 × imp | 9 | 12 | 10 |
| 4-9 × demon | 10 | 22 | 4 |
| 1 × baron of hell, 4-9 × imp | 13 | 21 | 10 |
| 1 × pain elemental, 3-8 × lost soul | 13 | 25 | 8 |
| 1 × former commando, 2-6 × former sergeant | 15 | 21 | 10 |
| 1 × baron of hell, 2-4 × hell knight | 20 | N/A | 4 |
| 3-6 × arachnotron | 20 | N/A | 3 |
| 2 × arch-vile, 4 × former captain, 4 × former sergeant, 3-6 × former human | 20 | N/A | 2 |
| 2 × baron of hell, 2-3 × former captain, 2-3 × former sergeant | 20 | N/A | 5 |
| 2 × arch-vile, 2-5 × mancubus | 20 | N/A | 4 |
| 2 × arch-vile, 2-5 × revenant | 20 | N/A | 4 |
| 2 × arch-vile, 3-9 × baron of hell | 25 | N/A | 4 |
| 2 × arch-vile, 2-8 × former captain, 2-3 × mancubus | 25 | N/A | 2 |
The following monster groups will only appear in deeper levels of Angel of 100 and Archangel of 666:
| A100-exclusive Monster Groups | |||
| Monsters | Minimum | Maximum | Weight |
| 4-9 × nightmare soul | 30 | 59 | 4 |
| 2 × baron of hell, 2-6 × nightmare imp | 30 | 59 | 4 |
| 2 × pain elemental, 2-5 × cacodemon | 30 | N/A | 4 |
| 3-5 × nightmare demon | 35 | 49 | 4 |
| 4-8 × nightmare demon | 50 | N/A | 4 |
| 2 × nightmare knight, 4-8 × nightmare imp | 60 | N/A | 4 |
| 2 × nightmare elemental, 4-6 × nightmare soul | 60 | N/A | 4 |
| 2 × nightmare knight, 2-3 × elite former captain, 2-3 × elite former sergeant | 70 | N/A | 3 |
| 1 × elite former commando, 2-3 × elite former captain, 2-3 × elite former sergeant | 70 | N/A | 2 |
| 3-6 × nightmare arachnotron | 70 | N/A | 2 |
| 1-3 × lava elemental, 2-3 × shambler | 75 | N/A | 1 |
| 1 × cyberdemon, 4-8 × baron of hell | 80 | N/A | 2 |
| 1 × agony elemental, 3-8 × nightmare cacodemon | 85 | N/A | 2 |
| 1 × nightmare arch-vile, 2-3 × elite former captain, 2-3 × elite former sergeant, 3-6 × elite former human | 90 | N/A | 2 |
| 1 × cyberdemon, 3-6 × bruiser brother | 90 | N/A | 1 |
| 2-4 × nightmare mancubus | 95 | 149 | 2 |
| 2-4 × nightmare revenant | 95 | 149 | 2 |
| 2 × nightmare arch-vile, 2-4 × nightmare mancubus, 2-4 × nightmare revenant | 100 | N/A | 2 |
| 2 × nightmare arch-vile, 2-5 × nightmare mancubus | 150 | N/A | 2 |
| 2 × nightmare arch-vile, 2-5 × nightmare revenant | 150 | N/A | 2 |
Notice that monster groups are the only way for some enemies to appear on very deep levels.
Each level is given a total danger rating depending on depth and difficulty level. Monster placement usually proceeds as follows: while the total danger of enemies placed so far is less than the danger rating of the level, pick a new monster or monster group and add it (entirely) to the level. Picking a monster or group is done using the weights as relative probabilities for all the monsters and groups with a valid dlevel range. When a monster group is picked, all its ranges are resolved uniformly and independently. Each monster is added to a random empty tile; for monster groups, each monster is added separately.
The total danger level is calculated from dlevel as follows:
| Difficulty | Danger |
| I'm Too Young to Die | 6 + 2.2 × dlevel |
| Hey, Not Too Rough | 0.6 × sqrt(500 × dlevel) = 13.4 × sqrt(dlevel) |
| Hurt Me Plenty | 20 × sqrt(dlevel) |
| Ultra-Violence | 32 × sqrt(dlevel) |
| Nightmare! | 40 × sqrt(devel) |
In addition to these monsters, certain level features (e.g. vaults) may cause additional monsters to spawn on the level without counting against this limit.