There doesn't seem to be a general "What Addon is this!?" section anymore (or my search-fu is weak this morning), but what is the "DMG LOSS" addon in these screenshots of <For The Horde>'s Kael'thas attempt? Is it part of XRaidStatus?
And what is the Damage Loss it's measuring? I'm assuming it would be something like the damage lost due to resists and melee misses/blocks/whatevers?