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In YGGDRASIL, Grenbera Purple Worms were one of the monsters that spawned around the swamp area where the Great Tomb of Nazarick was located originally. It guards the unconquered Great Tomb of Nazarick from enemy players and NPCs if caught on sight trying to trespass into their territorial ground before reaching the tomb.
A vast purple worm, over ten times the width of a human torso, with a surface that gleams wetly.
The Grenbera Purple Worm is a Level 74 monster that is known to move in packs, making them a troublesome foe, even a legion of players. If they happen to end up detecting intruders within their radius, the Grenbera Purple Worm will make sure of alerting more of their kinds to fend off its enemies.
- Some worm-like monsters used vibrations to navigate.