to continue on the affliction stuff, death hex is an awesome spell. It makes all melee attacks critical, so with both my warrior and Zevran hitting stuff from close up, even bosses would go down quite rapidly.
As for spell combinations, I picked up a few more.
Grease + firestorm = more fire. Good stuff.
Shatter - if you freeze people and hit them with the stone fist, they shatter. Instakill ftw.
death hex + death cloud = ridiculous damage. Seriously. Like 600+ damage per tick. Instant death for most baddies. That was actually an accident... I death hexed someone, and then a darkspawn cast death cloud and the creature practically blew up.
