TheWoWDBI was having trouble with this guy until I tried using my Anubisath Idol. He easily soloed the entire fight with health to spare.
Despite Demolish having a 50% miss chance it would nearly one shot the worms when it connected. Stoneskin and the humanoid resistance removed the damage from Acidic Goo almost completely. I ran Rupture in the third slot for the stun but didn't really need it.
Humanoid
Gutretch
Master Pet Tamer
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Gutretch has by far the best attitude of any of the pet battle opponents. Everything is less serious when you're dead I guess.
beat this guy completely with one level 25 rare emperor crab.
Details
This roster comes from the current game client's data files, so it is not a complete list of every NPC in the game - older world NPCs that are no longer in the modern client are absent.
Community notes from Wowhead · 113 comments
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Level and Map Tracking
The game data tunes Gutretch for levels 20 to 30, Wrath of the Lich King content.