This article is about the prayer altars. For the runecrafting altar, see Chaos altar
Chaos Altars are altars devoted to Zamorak found in several Chaos Temples and other eerie locations across Gielinor. You can recharge your prayer points at these altars.
Praying at the chaos altar in the Yanille Agility dungeon opens a trapdoor, damaging the player and dropping them to the lower level of the dungeon where poison spiders reside.
The Chaos altar in the deep wilderness can be used by members for faster prayer training, as explained here and here.