They have been known to wander through battlefields in the lower planes, picking over dying and regenerating creatures and souls, which has earned them the nickname "Hell's vultures." As achaierais are immune to the toxic clouds of others of their kind, they often work in conjunction to use these clouds to herd or scatter enemies, form long lines of black clouds to protect their retreat, or merely panic opponents in large melees. Achaierais are fond of disemboweling their targets and feasting on the hot entrails while their mortally wounded prey screams itself to death. Of course, as outsiders, achaierais have no need to eat, and their elaborate hunting routines are simply the bird-beasts' sick form of entertainment.