In Crystal Caverns: Uncommon spawn in the geonid tunnel that leads to the Eastern Wastes.
In Crystal Caverns, Fragment of Fear: Known to spawn from the very last spawn in the geonid cavers to the southern zone-out. "Dazzle" is cast on random targets. Every 20 seconds, this mob causes a cave-in (places random gems in player inventories). 10 seconds after this happens, it checks for these gems and hits players with an attack based on what gem they have.