I took it down with just Juan(killer) and Chris (water) in the level 60range. Juan almost makes it to easy, he can take down one of the crystals (from full life) and have hits to spare on the next one.
no, but it really doesn't matter, he's hitting 6-8 times a round for hi damage hits, his damage skills are the best, and his trainer skill adds melee damage for your whole party.