Herobizkit
Adventurer
I realize this is unhelpful, but I voted "don't do it". Mega-dungeons takes mega-long to play, and unless you have a pool of about 12 or so players to draw and rotate for each game day, you'll end up horribly disappointed.
Had I not voted as I did, I would have suggested True20. Fast, light cinematic rules where role-playing takes initiative over how much damage you can deal.
Had I not voted as I did, I would have suggested True20. Fast, light cinematic rules where role-playing takes initiative over how much damage you can deal.