A unique Succubus. Xhana can be recruited in the town lake event. The event triggers some time after you recruit Avy. Avy offers to summon her friend, for a blood sacrifice, you can choose to agree, MC loses 50 max morale, or leave. If you choose to recruit Xhana, she also comes with her demon familiar.
Xhana can be considered the strongest character in the game, as her potential is infinite. The combination of her trait focusing and skill soul devour, she can raise her mana, magic and strength forever, or at least as long as you're willing to put time into feeding her. This is further empowered by her multi hit melee and magic attacks. She can also be affected a total of 20 times by stat changing potions (and similar) instead of the usual 5; this stacks with the trait stable increasing the limit to 25. Her drawback is that she has a low health pool and max lust.
Another interesting feature is that her focusing trait can be passed on. Xhana is not the only unit who can raise their max mana. Glow worms and mana worms can also scale infinitely.