Hi, we're a 4/13H guild with jin'rokh, horridon, ji'kun and iron qon on farm.
We went to do our weekly tot run yesterday, killed jin'rokh HC no problems. we then killed horridon heroic (with 1 or 2 wipes); HOWEVER, for some reason, the damage increasing mechanic from horridon seemed to pass over to every other mob in the instance (including bosses) because we were hitting them for absurd amounts. I don't know what %, but we had constant 500-600k DPS from people who do normally 130-150k.
Naturally, we took advantage of this and cleared the first 11 bosses on ToT heroic with no problems at all using this damage increasing bug (stuck on Lei Shen - transitions suck!)
Of course, i'm not giving out our guild name or any of our members so we don't get banned, but I urge blizz to fix this, as it's easily exploitable; getting Lei Shen HC with 200% or whatever damage increase won't be as rewarding for guilds