Cryomancer
Arcane
That's the fun of these games. Seeing how ridiculous your bullshit, Build-Porn, Munchinkinned-out Monstrocity can get.
Yep. And you can beat the game with ANY class, with ANY archetype on normal and challenging. You only need pun pun builds to beat the game on unfair. I rather having a "win button" than a pointless class/mechanic that only exists to cause frustration on the lovers of that class.
For eg, a Win button would be composite deadly earth, because enemies has poor AI and doesn't try to avoid, wings and flying creatures can't ignore the ground effect like on P&P, among other things.
In other hands, NWN2 when brought Warlocks(a similar class mechanic wise except that warlocks has way more casting spell capabilities). destroyed the class. Chilling tentacles on P&P is a little similar to deadly earth. A greater invocation that on P&P has caster level + 8 AB and in game has a fix +5 AB meaning that the invocation only hits heavily armored enemies with a critical and after a hit, allow a FORT save vs paralyz. On P&P, the grapple check is much more unforgiving and while grappled, the target can't cast spells, fire ranged attacks, etc they are sitting ducks waiting to be dead by eldritch rays or worst, permanently changed into a toad/chicken(word of changing)