That's enough for about 48 casts of shrapmetal. I can't imagine how many Chandor has at 800. I only have one wizard in my party so the arena is still something of a challenge, but one shrapmetal close up will kill any gold dragon. I usually end up with a couple of characters close to zero hitpoints by the time I'm done. One of my goals is to be able to do the arena with no spells at all. It wouldn't be all that hard to kill them; it's surviving it that's the challenge, and of course all the repair.