# Chaos Temple (hut)

Chaos Temple
Released27 February 2002 (Update)
MembersNo
LocationWilderness
Wilderness level38
Map
 Location on World Map Frozen Waste Plateau ↑ Ice Path ← Chaos Temple (hut) → Lava Maze ↓ Forgotten Cemetery

The Chaos Temple is a structure in level 38 Wilderness, west of the Lava Maze. It contains a Chaos Altar where players can recharge and train their Prayer using bones on the altar (demonic ashes do not work). Free players may visit the temple, however only members may take advantage of the altar's benefits.

Praying at the Chaos Altar is a requirement for the Easy Wilderness Diary.

## Getting there

The easiest way to get to the Chaos Altar is to use a burning amulet's teleport to Lava Maze entrance and run south-west. However, the spot can be often crowded by player killers due to its proximity to Revenant Caves and King Black Dragon Lair, so an alternative and likely a safer way to get there is to use Ghorrock Teleport on Ancient Magicks and run south, or Cemetery Teleport on the Arceuus spellbook and run north. Alternatively, players who have an Obelisk in their player-owned house can use it to teleport to level 44 Wilderness and then run south. Otherwise, this can be done from ANY Obelisk if the Hard Wilderness Diary is complete.

## General Features

The Chaos Temple hut in Level 38 Wilderness.

A wine of Zamorak spawns on a table inside the hut, which can only be obtained by casting Telekinetic Grab. Players who have completed the hard Wilderness Diary will receive them in noted form. The wine respawns approximately every 28 seconds.

Players who kill the Chaos Fanatic may use the Chaos Altar to recharge their Prayer as it is very close.

Due to the altar's use for Prayer training while being in multi-combat, it is frequently targeted by player killers.

There is also the Elder Chaos druid who can unnote any type of bones for a fee of 50 coins per bone.

## Chaos Altar

Members can offer bones on the Chaos Altar, granting 3.5x Prayer experience per bone, the same bonus as a gilded altar with two burners lit. However, every bone offered on the altar has a 50% chance to not be consumed, which can repeat for the same bone repeatedly. Therefore, the average experience per bone is 2x the amount from a player-owned house gilded altar with both incense burners lit, or 7x the normal burying experience.

The 5% Prayer experience bonus of the Zealot's robes stacks multiplicatively with the Chaos Altar's bonus, yielding a 52.5% chance to not consume a bone, meaning they can effectively be buried an average of 2.1 times.

The Elder Chaos druid outside the temple will unnote bones for 50 coins each.

### Mathematical Proof

Geometric series representation of bones gained.

The 50% chance when offering a bone on this altar to not be consumed means they can be offered again, granting additional prayer experience and another 50% chance of not being consumed. This repeating series results in a 100% gain in experience. A proof demonstrating this is below:

Starting with ${\displaystyle x}$ number of bones, we wish to solve for ${\textstyle S}$, the number of bones you can offer to the altar. At a gilded altar, ${\textstyle S=x}$ because you can only offer each of the ${\textstyle x}$ bones a single time. At this altar however, after offering the first ${\textstyle x}$ bones, 50% (or ${\textstyle 1/2}$) will be left remaining to be offered again, which is ${\textstyle {\frac {1}{2}}x}$ bones. Those bones can be offered again, which will leave us with ${\textstyle {\frac {1}{2}}({\frac {1}{2}}x)={\frac {1}{4}}x}$ remaining. This can be repeated infinitely many times, and the total number of bones offered to the altar is ${\textstyle S(x)=x+{\frac {1}{2}}x+{\frac {1}{4}}x+{\frac {1}{8}}x+{\frac {1}{16}}x...}$. Factoring out the x, we have ${\textstyle S(x)=x(1+{\frac {1}{2}}+{\frac {1}{4}}+{\frac {1}{8}}+{\frac {1}{16}}...)}$. The part in the parentheses is a well-known geometric sum that converges to 2, so ${\textstyle S(x)=x\sum _{n=0}^{\infty }2^{-n}=2x}$ given an infinite amount of time and ideal circumstances (never dying and losing bones, for instance). For example, if a player offers 1000 bones to this altar and continues until they run out, they should expect to receive as much experience as offering 2000 of the same type of bone to a gilded altar with two burners lit.

An alternative proof observes that the average number of offerings can be thought of as the expected value of a negative binomial distribution formulated as the number of trials until a certain number of successes. Letting ${\displaystyle x}$ be the number of bones a player has to offer, the expected value of this distribution is ${\displaystyle {\frac {x}{p}}}$, where ${\displaystyle p=0.5}$ is the probability that a bone will be consumed for a given offering. Therefore, the expected number of offerings for ${\displaystyle x}$ bones is ${\displaystyle 2x}$ offerings, concordant with the previous result.

The 5% Prayer experience bonus of the Zealot's robes stacks multiplicatively with the Chaos Altar's bonus, yielding a 52.5% chance to not consume a bone. Using the above formulas, each bone can be used an average of 2.1 times, meaning only 95% as many bones are needed compared to using the Chaos Altar without the set, and 47.5% as many bones using a normal altar.

## Changes

Date Changes
7 December 2017
(update | poll)

The Prayer training benefits were added.

2 March 2017
(update | poll)

The wine of zamorak spawn was added.