25 man Arthas is perfect imo. I'm not a big fan of Soul Reaper since it can come off the back end of a 25k hit and the number of cooldowns you need to be able to make sure no tank dies.
Funny thing tho, even though they said they fixed it, our first target for Frostmourne's soul steal ability was the tank on the raging spirits.
One thing I can say about this fight is to ensure that no matter who you are, you have a movement speed enchant or a talent that increases your run speed or else defiles become an even bigger bitch.
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