PotM is the player shorthand for Priestess of the Moon, a hero from the original Dota, the community-made custom game built on Warcraft III that later inspired modern MOBAs. Short hero clips like this one circulated through Dota forums, highlight videos and soundboards, where players saved the lines and effects they recognised from matches. The clip survives because it is compact, instantly recognisable to old-school Dota players and easy to drop into edits, streams and memes without explaining the reference.