Fallout Shelter creatures

Creatures attacking the vault
Creatures will randomly attack the vault in the form of incidents. This can also happen after failing a rush. Mole rats and radroaches multiply into adjacent rooms if there are no targets in the infested room(s), or if none enter the room within a short time after they spawn. Mole rats' and radroaches' strength depends on the level of the room in which they spawn. An average dweller level inside that room may also be a factor.

Allowing the intruders to multiply will likely result in the vault's destruction. Radscorpions also appear in incidents. Unlike mole rats and radroaches, radscorpions don't multiply. Instead, they transverse to a random room if they are not killed fast enough in the previous room. They repeat the process until killed.

Creature encounter while exploring
Creatures can also be encountered by vault dwellers while out exploring, but will not physically be seen in the game. Killing these creatures gives the exploring dweller experience. If the dweller is too weak for killing the creature and must escape, they still gain ten percent of the score.

Creature encounter during quests
Creatures encountered in quests can be seen, unlike creatures encountered while exploring the wasteland. Dwellers are able to inflict critical damage against creatures found during quests. When a creature is of a higher level than normal, a skull will appear next to their health bar.

Mammals

 * Feral ghoul
 * Mole rat
 * Super mutant

Creature encounters while exploring:

Reptiles

 * Deathclaw

Creature encounters while exploring:

Arthropods

 * Radroach
 * Radscorpion

Creature encounters while exploring:

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