Deathclaws

These fearsome beasts are greatly feared in the Wasteland due to their tendency as terrifying killing machines. Any time you open your vault to send out explorers or welcome new dwellers or even when broadcasting a signal, there's a chance that you'll be inviting these uninvited guests. Deatchlaws are very hard to kill with conventional Weapons and they're capable of tearing through your dwellers. The best way to deal with a Deathclaw invasion is to focus on the rooms they're in and spam-healing your dwellers. If you don't have enough weapons, you may want to move your highest-leveled or well-equipped dwellers from room to room to combat them.