Cassandra Nova is the parasitic twin of Charles Xavier  and possesses powerful telepathic and telekinetic abilities similar to his. Currently she's in the void and live here. Wolverine and Deapool tried to get out of the void bur Cassandra love to collection unique people and wolverine is unique for Cassandra because he's the first wolverine in the void. Wolverine have a terrible past (his friend died bc he didn't helped them) and truly regret it. The void is a desert forgotten place / people