He is called drool because he is missing a lower jaw and thus drools everywhere. He is a player NPC with a flavor title of "The Griefer" because he ganks people. He was an NPC in vanilla and the Burning Crusade expansion that hung out in Stranglethorn Vale, a notorious PvP ganking spot during this particular time. Players would gank all through the zone on PvP realms and on PvE realms they would gank anyone trying to open the chest in the arena.
Humanoid
Drool
The Griefer
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Does anyone know what set does this NPC wear?
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 · 3 comments
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It's the mythic Felblade Armor set. Rogue T18 (http://www.wowhead.com/item-set=-1320/felblade-armor)
Level and Map Tracking
The game data tunes Drool for levels 10 to 45, Legion content.