The annihilation rune works more like a gun than your traditional kamehameha. Its prep mostly consists of the process of aiming it, which indeed was done, and of course the initial act of writing it, also done. Preps vary, especially if the magic is unique. Usually a prep is associated with power as a means to make things fair, stronger spells would require more preparation, so that wizards aren't spamming their godliest abilities without backlash.

EDIT: I'll be strictly honest with you, Div. I do want your character to be dead ASAP, I kind of want out of this fight. But forfeiting isn't an option I give myself.

You wrote your character sheet beyond a level of vagueness I thought humanly possible, to the point where I was practically forced in to misinterpreting it. Those bracketed abilities? I thought all of them were just magical domains Corban had read up on, so he could react to them accordingly. You even placed them right where it would hint towards that. Then I find out each bracketed ability could constitute a thousand or so spells, you can imagine how tricked I felt.

'Likes Evocation,' still doesn't explain anything he's done with evocation so far. It just means he appreciates it.