I have played this game a bit, but never managed to complete it. I struggle to hold interest in my campaigns, tend to get bored after a few hours in one game. I also die a lot.
If I every manage to complete a run, it will probably be with a troll melee character or somesuch. Trolls stronk.
Summoning magic also seems really stronk, but having to keep resummoning critters every fight is annoying.
I heard there are a lot of bullshit magic attacks in the late game/post game, which makes me not feel that interested in trying to get a billion runes or something.
If I every get back into this type of roguelike I may try a different game actually, there are a lot of other cool roguelikes these days with decent graphical interfaces.