Chaotic Riftedit this page
From WoWWiki
Chaotic Rifts are non-moving mobs within The Nexus. They also lack an aggro table. Regardless, the rifts can be dangerous if left alone due to the energy volleys they send out to nearby players and mobs. Mages used to be able to take them out at max range without aggroing other mobs, but this exploit got fixed in an unspecified patch.
