Once you have all your buffs up (assuming you're doing it right), WAR is healing itself about as much as it's getting hurt (until the TP is gone). Vengence/Foresight for lowering damage taken and Bloodbath/InnerRelease/Berserk/Unchained + Overpower is about 20 seconds of near-invincibility on large pulls.
I also try to put Maim up first.
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