Mythic+ tuning hotfixes have returned after a hiatus with massive nerfs to difficult bosses and huge nerfs to Neltharus. Thanks to Dorovon for helping parse some of these hotfixes.
Items Immature Venom Sac no longer works in Mythic+ dungeons or raids. Brackenhide Hollow GashtoothGash Frenzy periodic damage reduced by 25%.Decatriarch Wratheye
Withered Eruption damage reduced by 10% Rotburst TotemRotting Burst cast time increased to 7 seconds (was 5 sec) Halls of Infusion Watcher IrideusPower Overload Number of targets reduced to 2 (was 3). Periodic damage reduced by 33%. Neltharus Trash:Irontorch Commander health reduced by 15.4% Qalashi Lavabearer health reduced by 11% Qalashi Warden health reduced by 11%.Magmatusk
Health reduced by 10% Magma Eruption periodic damage reduced by 25%. Lava Wave damage reduced by 14.3%. Lava Spray damage reduced by 21.6% Magma Lob now fires a pool every 6.5 sec (was 5 sec).Forgemaster Gorek
Health reduced by 10%. Blazing Hammer damage reduced by 20%.Warlord Sargha
Health reduced by 10%. Molten Gold periodic damage reduced by 20%. Neltharion's Lair Trash:Vileshard Crawler's Acid Splatter damage no longer scales with Mythic+ level.Rokmora
Crystalline Ground damage reduced by 25%Naraxas
Toxic Retch damage reduced by 25% Uldaman Sentinel TalondrasEarthen Shards periodic damage reduced by 20%.Emberon
Seeking Flame visual updated and is much easier to see (see clip). Underrot Grotesque HorrorDark Echoes cast time increased to 1.5 sec (was 1 sec) Vortex Pinnacle AsaadSkyfall Nova — Damage reduced by 20% Read more on wowhead.com