Quick Links
Similar to other survival games like Terraria and State of Decay, you can find several helpful NPCs while exploring the underground inCore Keeper. Sure, you could leave them out in the wilderness, but if you do, they might die, or you’ll have to search high and low for them every time you want to buy an item.
It’s much more convenient for you – and a lot safer for them – if the NPCs are housed in a location near your base, or within your base itself, but you’ll have to do a bit of work if you want them to move in.

How To House NPCs
NPCs aregenerally unlockedby defeatingcertain bosses or completing a specific challenge, and will either be freed from prison upon beating them, or you’ll receive aspecial furniture item required to house them.
NPCs can be targeted and killed by enemies like Cattle, so you’ll want to move them somewhere safeas soon as they’re unlocked to prevent having to wait for them to respawn.

Nuclear Battery Idol
N/A
Obtained when completing a Challenge Arena found in an Alien Tech Lab scene in the Shimmering Frontier biome.
Tokeep NPCs from wandering around or dying, you’ll want tohouse them in a secure room, but that room needs tomeet several requirements to be validhousing for them:
As soon as theserequirements are met, the NPC will immediatelymove into the room you’ve builtfor them, and wander within that space.
It’spossible to find the Fishing Merchant and Cloaked Merchant without beating their respective bossesby finding their scene.
The Fishing Merchant’s spawns 500 Tiles away from The Core in Azeos' Wilderness biome, and the Cloaked Merchant’s spawns 200 Tiles away from The Core in the Forgotten Ruins biome.
They canwander outside if you leave the door open, but you canbreak and replace their furniture itemto make themrespawn back inside, or break their furniture item andhold it in your hand to lead them around.