TheWoWDBCreeping Sludge usually come in a group of 4 and has very heavy hitting melee attacks. They move very slowly though so the key to beating them is keeping your distance and using ranged attacks.
Elite
Creeping Sludge
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the bane of all Melee DPS
These also have a devastating AOE that it constantly uses, it has a very short range.
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 · 8 comments
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Level and Map Tracking
The game data tunes Creeping Sludge for levels 10 to 30, Classic content.