Looking for a prestige class.

[ngilop]

Hello everybody.
I am wondering if their are any prestige classes that fit the theme that
I am looking for.

I am looking for one that encompasses a warrior who gains powers from
a demonic source but they themselves are not corrutped ( i.e. does not
have to be evil) something akin to the Ghost-faced killer but without the
focus on stealth. bonus points if you can become an outsider at the very end.

thanks in advanced