I don't mark, but I do appreciate when folks kill the birds first in Fractals so I don't have to stun Furore. Same goes for people who naturally kill the four bees in Neverreap in any order that doesn't have all four bees hitting ~20% simultaneously. Neither is necessary in a dungeon given how easy they are, but it bothers me as a tank to take unnecessary damage.
I used to mark the exploding guy in AK hard boss 2 and the Harriers in SV Hard that summon another dragon.
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