I got Ony to 315k the other night before she pretty much fried me. That was the first time I'd even seen her (I have never been a raider) and I decided on a whim to run in and try to kill her. She decided otherwise

I couldn't figure out how to get her when she was in the air, and she just sat there and fireballed me to death. Finally got my DK uncrittable since then, and some nice BoE epics for the shaman, so I may try again when I make it a point to get the dungeon achievements.