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Grobbulus, Healer Guide

Updated 9 months, 4 weeks ago for patch 1.13.6 and Season of Mastery by Preston. View the change log.

Grobbulus Dungeon Journal ModelThis page covers a healer-focused strategy for Grobbulus in Naxxramas. While it's tailored for healers, other roles may also find the information useful. If you have any suggestions or feedback, you can leave a comment below or tweet @PrestonDvorak.

This guide has been updated and maintained based on my own experiences with the encounter, logs information, and Dungeon Journal information. I'll continue to update it as-needed.

General Mechanics and Abilities

  • The tanks will be dealing with the expanding Poison Clouds that appear at the boss' location throughout the encounter, likely forcing the boss to be moved.
    • Additionally, if the top threat target isn't in melee range, Slime Stream deals fatal damage to all players.
  • Don't stand in front of the boss to avoid Slime Spray.
    • Each player hit spawns a Fallout Slime.
      • Fallout Slime
        • Stay more than 15-yards away to avoid the damage over time from Disease Cloud.
  • Targets random players with Mutating Injection (dispel, disease), which leaves behind a Poison Cloud when it expires or is dispelled.
    • Players should move to a designated area, or near existing Poison Clouds, before being dispelled.
  • After 12-minutes, Enrages, gaining increased physical damage dealt and attack speed.

Season of Mastery Differences

  • Currently, I'm not aware of any mechanical differences.
  • There are new quests offered by Archmage Tarsis Kir-Moldir just inside Naxxramas, and it was suggested that these could lead to surprises that "have a significant impact" inside and outside Naxxramas.

Resistance Levels

  • Players generally won't make use of any additional resistances on this encounter.

Healing Notes

The notes below mostly pertain to progression difficulty, meaning if you out-gear the difficulty you're on or use extra healers they may not apply.

  • As long as Poison Clouds are managed properly there won't be a significant amount of healing during this encounter.

Debuffs to Track


Healer DBM Settings for Grobbulus Thumbnail
Healer DBM Settings for Grobbulus


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Changelog - View the last ten changes. - +

August 05, 2022 - 8:08 pm (Healer) - Reviewed for Season of Mastery. Some minor clarifications and spell ID corrections were made.

August 05, 2022 - 8:08 pm (Healer) - Reviewed for Season of Mastery. Some minor clarifications and spell ID corrections were made.