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The Chaos Temple is a structure in Level 38 Wilderness. It contains a chaos altar where players can recharge their Prayer. The hut has two levels, a ground floor containing the altar and a upper, outside ledge or balcony where four Elite Black Knights patrol. There are no stairs or other direct connection between the two levels. The balcony can be accessed via Lucien's camp to the west, although this is not possible until completing a large portion of the Grandmaster quest While Guthix Sleeps. This area is also often used for some coordinate clue scrolls which lead to right behind the altar.
The fastest method of reaching the temple is via the spell Ghorrock Teleport from the ancient magicks spellbook, which is a short distance northeast of the temple. The level 44 Wilderness obelisk is very close to this teleport spot.
South of the altar is a rock formation which appears to be a set of stairs. Lucien emerges from this during the While Guthix Sleeps quest, and then proceeds to summon an army of Undead heroes. Thus, it likely connects to Lucien's camp, although players can not enter it.