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They may be able to work together as long as they're "biology" lend them attending to compatibility for"biologically compatible" ,for example:

Elemental monsters of fire and ice probably not the best, but what about water and electricity?

The other main factor iI see is communication. Are they able to communicate? Or they even need to?

IntelligentAlso it is possible that intelligent monsters may be able to tamehave tamed others Theor that the dungeon itself may be a hive mind

The kill each other aspect may depend on the origin of monsters, if. If they where spawned from the same dungeon then they are kind of brothers consider the others as their kin.

They may be able to work together as long as they're "biology" lend them attending to compatibility for example:

Elemental monsters of fire and ice probably not the best, but what about water and electricity?

The other main factor i see is communication. Are they able to communicate? Or they even need to?

Intelligent monsters may be able to tame others The dungeon itself may be a hive mind

The kill each other aspect may depend on the origin of monsters, if they where spawned from the same dungeon they are kind of brothers

They may be able to work together as long as they're "biologically compatible" ,for example:

Elemental monsters of fire and ice probably not the best, but what about water and electricity?

The other main factor I see is communication. Are they able to communicate? Or they even need to?

Also it is possible that intelligent monsters have tamed others or that the dungeon itself may be a hive mind. If they spawned from the same dungeon then they consider the others as their kin.

1
source | link

They may be able to work together as long as they're "biology" lend them attending to compatibility for example:

Elemental monsters of fire and ice probably not the best, but what about water and electricity?

The other main factor i see is communication. Are they able to communicate? Or they even need to?

Intelligent monsters may be able to tame others The dungeon itself may be a hive mind

The kill each other aspect may depend on the origin of monsters, if they where spawned from the same dungeon they are kind of brothers