If you've ever wanted to have Deathclaws guard your various settlements around the Commonwealth, now's your chance.
Use a friendly Deathclaw to protect Sanctuary Hills from Raiders or enemy Deathclaws. Or, if you'd rather use some of the robots from the Automatron DLC, use those to protect your dwellings. It's up to you.
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NPCs won't just stand in place either. They will roam around your settlements looking for danger or something else to do. Each NPC will cost you a bottlecap to create but that's nothing for most people.