So I've always been enamoured with the idea of playing a Lawful Evil character. However, I couldn't ever find a way to justify it in my DMs homebrew world.

Long story short, there's a giantass wall. If that wall ever goes down, demons will flood the world and murder everyone.

I'm gonna play a demon (or tiefling, if I can't find a way to get that balanced) that's based around having a high charisma and magic skill. Basically, I'm creating a "sell your soul to this guy" sorta character. I couldn't figure out HOW to justify him not wanting the wall destroyed (and I didn't wanna be a mole/traitor dick).

However, I've recently been rereading a book from my childhood, and I'm taking inspiration from it. The book is Lord Loss, and long story short, I find humans FUN. I feed off sorrow (or, to not be cliche, just enjoy it), and if someone tears down the wall and all the humans die, who can I manipulate for fun THEN?

So, class/feat/general build ideas...? :D