Ravers are bodiless evil spirits with the ability to possess and control some lesser creatures, and most humans as well. Giants and Bloodguard are typically immune to this power, and there are no known instances of a Raver possessing a Ranyhyn. There are only three Ravers, ancient brothers who each have many names but are commonly called turiya Herem, samādhi Sheol, and moksha Jehannum. Their greatest hatred is reserved for the trees of the One Forest of old, and their loathing of the Earthpower and all good things has led them to become Lord Foul's willing servants. The Despiser is somehow able to enhance their abilities when he pleases, but can prevent them from possessing individuals he deems too powerful. (They were not allowed to possess Thomas Covenant, for instance, because his ring