Hey everyone. I would like to know what are the combos you found in the game.
 
I only found 2 so far: 
 
Freeze (cone of cold) and stonefist will outright kill alot of guys
Vulnerability hex and drain life will double the drain effect

Adding on to your two combos: you can use petrify as well as cone of cold and you can use stonefist, crushing prison, or crits to shatter them but higher tiered enemies might resist the effect. Also the vulnerability hex and drain works with mana drain as well as drain life. 
 
New ones: Glyph of Repulsion + Glyph of Paralysis right on top of it creates a paralysis explosion that can have friendly fire. 
Force Field + Crushing Prison creates an explosion originating from the dude in the force field 
Sleep + Horror gives the target a nightmare dealing massive spirit damage and the effects of horror. Also, if you use waking nightmare on enemies that are asleep they can't resist it but it is not counted as a combo. 
Spell Might + Raise Undead raises an upgraded skeleton with some spells I think 
Finally if you cast Blizzard or Tempest and then use Spell Might and cast whichever spell you didn't cast first it will create Storm of the Century with a greater radius and I'm told 70 dmg per tick. 
 
I've only tried the Paralysis Explosion, Shatter, Super Drain, and Nightmare combos so I don't know if the others I listed will work. 

I personally like the combination of earthquake tempest, because the guys just keep falling down while they take constant damage.  Another one is blood wound and chain lighting.  They can't move and are just keep taking heaps of damage.