Jider from Impervious (US-Stormreaver) is back with another video! After his solo kill of Patchwerk in 25-man Naxxramas, he decided it would be fun to take down Grobbulus as well!
Description from the Youtube video
Right away you will notice similarities to my strategy for killing Patchwerk. The initial pull spot is at his the end of his patrol path to maximize the time I have for evade-mode intercepts after a Vanish. To eliminate physical damage from the encounter I only engage in melee range when Evasion is up and use Dig Rats and Shadowstep to kite while waiting for the cooldown. Dig Rat placement is critical as I need both locations to ensure the proper kiting path.
In addition to physical damage, Grobbulus has a few abilities that I had to account for, most notably Slime Spray. Not only does this ability do significant damage in a frontal cone, if it hits a player it will spawn a Fallout Slime which would guarantee a wipe. The Slimes are extremely dangerous due to their ability to inflict damage and the difficulties of kiting multiple mobs that move at different speeds. The method I use to counter this relies on the fact that Grobbulus will never cast Slime Spray for at least 23 seconds after the pull or a Vanish. So, in addition to only engaging with Evasion I also only engage immediately after a Vanish which will let me attack for the full duration without having to worry about Slime Spray.
With the strategy set, the rest of the fight again becomes an exercise in repetition with one very important detail. The kiting path for Grobbulus is very limited due to his leash point at the front of the room and keeping him at greater than 45 yards to stay out of range of Slime Spray. Through trial and error I was able to determine the correct timings to keep him bouncing back and forth inside his room for the duration of the fight (2 hours 45 minutes).
Originally Posted by Blizzard Entertainment