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In NetHack, certain monsters have a tendency to appear in groups. Due to this, they are more common than their monster frequency would imply.

A "large" group consists of 2-11 monsters and a "small" group of 1-4.[1] If more than one monster is generated, the number of additional monsters is divided by 4 for players of level 1 or 2, and halved for players of level 3 or 4, but is always at least one.[2] Extra monsters are never peaceful.[3] If a monster created as part of a group would be peaceful, it's skipped; this can effectively reduce the group size for some monsters.

A common strategy for killing monster groups in NetHack is to lure them into a corridor or doorway, so only one member of the group can attack the player at a time, preventing the group from overwhelming the player.

Monsters that appear in small groups

These monsters have a 12 chance of appearing in groups of 2-4:

Monsters that appear in large groups

With a 2 in 3 chance, they're generated in groups of 2-11; otherwise, a group size of 2-4 is used. The average group size is thus 513.


SLASH'EM adds "very large" groups of size 2-21.[4]

SLASH'EM monsters that appear in small groups

SLASH'EM monsters that appear in large groups

SLASH'EM monsters that appear in very large groups


This page may need to be updated for the current version of NetHack.

It may contain text specific to NetHack 3.6.1. Information on this page may be out of date.

Editors: After reviewing this page and making necessary edits, please change the {{nethack-361}} tag to the current version's tag or {{noversion}} as appropriate.