Recently pulling heroic Zon’ozz and felt the fight on heroic was missing the chaotic feel from my memory raiding years ago… I have since realized that on both encounters in the title, the rooms are supposed to experience a visual effect that reflects a phase transition as mechanics and raid damage roll out.
For Yors’ahj this is changing of the room to the color of ooze’s absorbed (ie black or green). On Zon’ozz after the ball hits the boss the room is supposed to go black for the tentactle disco party on heroic mode.
Its not affecting the mechanics of the fight, but rather the feel! Would be a wonderful hotfix to add these original designs to embrace the original feeling of Dragon Soul and keep the crazy disco tentacle party vibes just right on Zon’ozz!
For reference, please see the original epic kill videos from Paragon as reference:
Yor’sahj: https://www.youtube.com/watch?v=AF3UyRN_sC8 (Example at 1:38)
Zon’ozz: https://www.youtube.com/watch?v=Y2i7WwOgFSA (Tentacle Disco Party at 2:08!)