Zoltun Kulle was corrupted very fast, he's centuries old. He was a horadric mage along with Tal'Rasha and Jared Cain that gave into the Prime Evils pretty quickly. He became immortal eventually and they had to cut his head off and bury it under the sand, then send his body to another dimension to keep him from coming back.
Yeah, there's no way good old Deckard is evil. However, Diablo might kill him, OR The event might not have to do with Cain at all. They mentioned an original Horadrim who became evil, Zoltun Kulle who is immortal and imprisoned. So maybe its his event.
I don't think Cain has anything to do with Leah being possessed. People have become corrupt before without much interference, like Leoric, Leah's grandfather. I think she either puts the soulstone in herself, or someone else does.
Seems like a nice spot for the black soulstone to fit on her chest. Not sure she stays possessed though, maybe someone steals the stone afterwards and she's just undead or something.
Yeah but Deckard Cain is the last Horadrim. If its "The End Of the Horadrim", that means the end of Cain.
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