Can someone explain level draining?

[Querzis]

True. But they could do other types of attacks too. Isn't there a "weakness to fire" spell? Combine that with fireball. I know level draining is effective but surely there's alternatives that are just as effective.

Not really, pretty much the only thing more effective (especially against spellcaster) then level drain in a duel are save or die spells. Save or die spells are barely ever used at all in the comic for obvious reason, they are just so anticlimatic and boring, just go watch the «ultimate cleric battle» again. Personally, we stopped using those in all my D&D groups a long time ago, not just because they're overpowered but mainly because, once again, they are frigging boring. So yeah, any spellcaster that know what hes doing is gonna have some level-drain spell if they can access to it, its just common sense. And as for Sabine, shes a succubus...pretty much all they do is level-draining really. Thats kinda why Durkon is researching that mass death ward and thats also why you always want a cleric in your party. Too bad he hadnt finished his research in this comic.