Introducing... The hermit

A hermit is essentially a villager who lives by themselves in isolated areas of the over world. They live in small, hard to find huts, tree houses, or caves but are worth seeking out because they offer special or unusual trades, depending on the biome. Ideas include A swamp hermit, who lives in a hut and sells potions A jungle hermit, who lives in a treehouse and sells redstone devices A mountain hermit, who lives in the cave at the top of mountains and sells extremely high value enchanted swords