Fallout Shelter creatures

Creatures attacking the vault
Creatures will randomly attack the vault in the form of incidents. In the cases of mole rats and radroaches this can also happen after failing a rush. Mole rats and radroaches multiply if there are no targets in the room, 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 your vaults destruction.

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.

Mammals

 * Mole rat

Creature encounters while exploring:

Reptiles

 * Deathclaw

Creature encounters while exploring:

Arthropods

 * Radroach

Creature encounters while exploring:

Créatures de Fallout Shelter Существа Fallout Shelter