Crystal chest

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TaverleyPrifddinas

Crystal chest

Release date	27 February 2002 (Update)
Members	Yes
Quest	No
Location	Taverley
Examine	A crystal key can open it.

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Crystal chest

Release date	22 September 2014 (Update)
Members	Yes
Quest	Plague's End
Location	Prifddinas
Examine	A crystal key can open it.

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The crystal key chest is a treasure chest located in Ivy Sophista's house in Taverley. A second chest is located in Prifddinas in the Iorwerth Clan district. The chests are locked and can only be opened by a crystal key. Attempting to open the chest without the crystal key yields the message: "This chest is securely locked shut." The crystal key is made up of a loop half of a key and a tooth half of a key; you can make the crystal key by using them with each other or selecting the "Assemble" option.

Opening a crystal chest grants a variety of rewards, which always include an uncut dragonstone. The crystal chest in Prifddinas grants slightly better rewards than the Taverley chest. The crystal key sells for more than most of the rewards, making it generally more profitable to sell the key than to use it. The key is used once and disappears upon usage.

Rewards possibilities

The chest loot always includes an uncut dragonstone, together with a random reward generated from 13 possible reward tables. Below are the values of the chest's contents, based on current Grand Exchange prices. Unless otherwise specified, all possibilities give all of the listed rewards when obtained.

After an update, wearing a ring of wealth will increase your chances of getting a better drop.

It is only possible to obtain rune platelegs if you are a male character, and a rune plateskirt if you are a female character.

Taverley chest

Possibility 1 - Fruit tree seed

The expected value of Possibility 1 is 17,139, which is a profit/loss of −4,672 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Calquat tree seed	1	Common	321
	Papaya tree seed	1	Common	2,896
	Palm tree seed	1	Uncommon	39,600

Possibility 2 - Lantadyme seeds

The expected value of Possibility 2 is 13,529, which is a profit/loss of −8,282 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Lantadyme seed	2	Common	1,452

Possibility 3 - Grimy torstols

The expected value of Possibility 3 is 22,855, which is a profit/loss of 1,044 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Grimy torstol	2	Common	10,778

Possibility 4 - Runes

The expected value of Possibility 4 is 172,427, which is a profit/loss of 150,616 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Law rune	50	Common	28,500
	Chaos rune	50	Common	7,600
	Cosmic rune	50	Common	20,600
	Death rune	50	Common	11,600
	Nature rune	50	Common	20,250
	Body rune	200	Common	9,600
	Mind rune	200	Common	3,800
	Earth rune	200	Common	3,600
	Air rune	200	Common	18,000
	Water rune	200	Common	5,000
	Fire rune	200	Common	31,800

Possibility 5 - Iron ore

The expected value of Possibility 5 is 101,877, which is a profit/loss of 80,066 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Iron ore	200 (noted)	Common	89,800

Possibility 6 - Coal

The expected value of Possibility 6 is 28,877, which is a profit/loss of 7,066 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Coal	150 (noted)	Common	16,800

Possibility 7 - Rune bars

The expected value of Possibility 7 is 21,032, which is a profit/loss of −779 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Rune bar	3	Common	8,955

Possibility 8 - Gems

The expected value of Possibility 8 is 32,132, which is a profit/loss of 10,321 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Uncut diamond	3	Common	14,529
	Uncut ruby	3	Common	5,526

Possibility 9 - Loop half of a key

The expected value of Possibility 9 is 38,130, which is a profit/loss of 16,319 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Loop half of a key	1	Common	11,053
	Coins	15,000	Common	15,000

Possibility 10 - Tooth half of a key

The expected value of Possibility 10 is 38,615, which is a profit/loss of 16,804 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Tooth half of a key	1	Common	11,538
	Coins	15,000	Common	15,000

Possibility 11 - Rune platebody

The expected value of Possibility 11 is 49,557, which is a profit/loss of 27,746 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Rune platebody	1	Common	37,480

Possibility 12 - Rune platelegs or plateskirt

The expected value of Possibility 12 is 49,079 for male characters and 49,138 for female characters, which is a profit/loss of 27,268 for male characters and 27,327 for female characters, if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Rune platelegs	1	Common	37,002
	Rune plateskirt	1	Common	37,061

Possibility 13 - Dragonstone armour

The expected value of Possibility 13 is 7,292,370, which is a profit/loss of 7,270,559 if buying the crystal key on the GE.

Receiving this possibility is very rare, at a rate of 1/6801.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Dragonstone helm	1	Very rare	7,341,200
	Dragonstone hauberk	1	Very rare	12,743,872
	Dragonstone greaves	1	Very rare	6,133,880
	Dragonstone gauntlets	1	Very rare	5,932,094
	Dragonstone boots	1	Very rare	4,250,417

Prifddinas chest

This chest was released with the first part of Prifddinas on 22 September 2014, and is located in the Iorwerth Manor against the south wall. It has an improved drop table over the chest in Taverley. At the least, the player should still wear a Ring of wealth when opening either crystal chest.

Possibility 1 - Tree seeds

The expected value of Possibility 1 is 55,516.6, which is a profit/loss of 33,705.6 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Yew seed	1	Common	15,302
	Papaya tree seed	1	Common	2,896
	Elder seed	1	Uncommon	180,802

Possibility 2 - Herb seeds

The expected value of Possibility 2 is 13,979, which is a profit/loss of −7,832 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Dwarf weed seed	1	Common	822
	Torstol seed	2	Common	1,080

Possibility 3

The expected value of Possibility 3 is 49,832, which is a profit/loss of 28,021 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Grimy lantadyme	5	Common	37,755
	Crystal tree blossom	1	Common	Not sold

Possibility 4 - Talismans

The expected value of Possibility 4 is 18,178, which is a profit/loss of −3,633 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Fire talisman	5 (noted)	Common	1,045
	Water talisman	2 (noted)	Common	5,056

Possibility 5 - Rune Halberd

The expected value of Possibility 5 is 21,455, which is a profit/loss of −356 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Rune halberd	1	Common	9,378

Possibility 6 - Ores

The expected value of Possibility 6 is 23,307, which is a profit/loss of 1,496 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Coal	80 (noted)	Common	8,960
	Adamantite ore	10 (noted)	Common	2,270
	Corrupted ore	50	Common	Not sold

Possibility 7 - Rune bars

The expected value of Possibility 7 is 21,032, which is a profit/loss of −779 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Rune bar	3	Common	8,955

Possibility 8 - Uncut gems

The expected value of Possibility 8 is 32,132, which is a profit/loss of 10,321 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Uncut diamond	3	Common	14,529
	Uncut ruby	3	Common	5,526

Possibility 9 - Loop half of a key

The expected value of Possibility 9 is 23,130, which is a profit/loss of 1,319 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Loop half of a key	1	Common	11,053
	Crystal motherlode shard	10	Common	Not sold

Possibility 10 - Tooth half of a key

The expected value of Possibility 10 is 23,615, which is a profit/loss of 1,804 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Tooth half of a key	1	Common	11,538
	Crystal motherlode shard	10	Common	Not sold

Possibility 11 - Rune armour

The expected value of Possibility 11 is 63,619, which is a profit/loss of 41,808 if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Rune full helm	1	Common	20,892
	Rune kiteshield	1	Common	30,650

Possibility 12 - Rune platelegs or plateskirt

The expected value of Possibility 12 is 49,079 for male characters and 49,138 for female characters, which is a profit/loss of 27,268 for male characters and 27,327 for female characters, if buying the crystal key on the GE.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Rune platelegs	1	Common	37,002
	Rune plateskirt	1	Common	37,061

Possibility 13 - Dragonstone armour

The expected value of Possibility 13 is 7,292,370, which is a profit/loss of 7,270,559 if buying the crystal key on the GE.

Receiving this possibility is very rare, at a rate of 1/6801.

	Item	Quantity	Rarity	GE price
	Uncut dragonstone	1	Always	12,077
	Dragonstone helm	1	Very rare	7,341,200
	Dragonstone hauberk	1	Very rare	12,743,872
	Dragonstone greaves	1	Very rare	6,133,880
	Dragonstone gauntlets	1	Very rare	5,932,094
	Dragonstone boots	1	Very rare	4,250,417

Probabilities

Taverley chest

The probabilities in this section are an estimation based on the data of 1000 crystal chest loots on the Taverley chest, while wearing a luck of the dwarves.

Possibility	Percentage
Possibility 1: Fruit tree seed	6.4%
Possibility 2: Lantadyme seeds	7.9%
Possibility 3: Grimy torstols	9.4%
Possibility 4: Runes	10%
Possibility 5: Iron ore	9.1%
Possibility 6: Coal	9.8%
Possibility 7: Rune bars	9.4%
Possibility 8: Gems	8.3%
Possibility 9: Loop half of a key	7.4%
Possibility 10: Tooth half of a key	6.8%
Possibility 11: Rune platebody	7.2%
Possibility 12: Rune platelegs or plateskirt	8.3%
Possibility 13: Dragonstone armour	< 0.01%

Using these probabilities, the expected average profit/loss, per crystal key, when looting the crystal chest is 29,584. Assuming you will receive whichever of the rune platelegs and rune plateskirt is worth more, and the crystal key is bought at GE price. This is excluding the possibility of receiving a dragonstone armour piece, as this possibility is much too rare to estimate with any acceptable accuracy.

Prifddinas chest

The probabilities in this section are an estimation based on the data of 20,000 loots of the Prifddinas crystal chest while wearing luck of the dwarves. The loot from the Prifddinas chest is not affected by the Voice of Seren.

Possibility	Percentage
Possibility 1: Tree seeds	7.59%
Possibility 2: Herb seeds	7.555%
Possibility 3: Grimy lantadymes	4.47%
Possibility 4: Talismans	7.545%
Possibility 5: Rune Halberd	6.00%
Possibility 6: Ores	10.36%
Possibility 7: Rune bars	9.455%
Possibility 8: Gems	9.525%
Possibility 9: Loop half of a key	9.30%
Possibility 10: Tooth half of a key	9.045%
Possibility 11: Rune full helm and rune kiteshield	8.81%
Possibility 12: Rune platelegs or plateskirt	10.34%
Possibility 13: Dragonstone armour	< 0.01%

Using these probabilities, the expected average profit/loss, per crystal key, when looting the crystal chest is 10,782. Assuming you will receive rune platelegs, the crystal key is bought at GE price and the luck of the dwarves ring is worn. This is excluding the possibility of receiving a dragonstone armour piece, as this possibility is much too rare to estimate with any acceptable accuracy.

Estimate probabilities for non-guaranteed loot are:

• 17.785% chance of crystal motherlode shard when rolling possibility 9 or 10. This assumes that possibility 9 and 10 yield the same chance for crystal motherlode shards.
• 8.675% chance of receiving elder seed when rolling possibility 1.
• 63.385% chance of receiving papaya tree seed when rolling possibility 1.
• 27.94% chance of receiving yew seed when rolling possibility 1.
• 20.39% chance of receiving dwarf weed seed when rolling possibility 2.
• 79.61% chance of receiving torstol seed when rolling possibility 2.

Trivia

• The crystal key chest was reworked on 11 June 2013 with the release of the Triskelion Treasures. Previous old drops, such as receiving 2,000 coins and a Spinach roll along with an Uncut dragonstone, were removed, and new ones were added, such as the Dragonstone armour.
• The estimated dragonstone armour possibility chance is about 0.000147%.