Keystone

Keystones are objects found when digging for archaeology artifact fragments using the archaeology profession. The keystones are specific to racial artifacts (i.e. there are dwarven keystones, night elven keystones, and so on) and add 12 fragments to some archaeology projects, though not every project will allow the player to use a keystone.
When a player can use a keystone to complete a project, a hexagonal socket will appear at the bottom left of the project window. If the player has a keystone in his or her inventory, the player may then left-click the socket and the keystone will be placed in it (though it will not be consumed until the player solves the artifact). The keystones may be used exactly like 12 fragments, meaning that if a keystone gives more fragments than necessary to complete an artifact, the extra fragments will roll over to the next artifact project. If a player changes their mind about using a keystone before solving the project, they can left-click the socket again to remove the keystone.
Common artifacts that permit keystones only allow the use of one or two. Rare-quality artifact projects may permit the use of up to three keystones. There are no keystones available for use with Fossil projects.
==Keystone types==
There are several known kinds of keystones, each matching a race.
==Keystone dungeon buffs==
Some keystones can be used near the entrance of Cataclysm dungeons to grant a group-wide buff for the duration of the run.
 Archaeological Dungeon Monuments
Dungeon 	Keystone 	Monument 	Buff
Throne of Tides 	Highborne Scroll 	Strange Fountain 	10% bonus damage against the naga
Blackrock Caverns 	Dwarf Rune Stone 	Stone Tablet 	Reduces elemental damage done to you by 5%
The Stonecore 	Dwarf Rune Stone 	Broken Pillar 	Physical damage taken is reduced by 5%
Vortex Pinnacle 	Tol'vir Hieroglyphic	Magical Brazier 	Heals wounds and replenishes mana slowly over time
Lost City of the Tol'vir	Tol'vir Hieroglyphic	Tol'vir Grave 	10% bonus damage against the Neferset
Halls of Origination 	Tol'vir Hieroglyphic	Large Stone Obelisk	Improves movement speed
Grim Batol 	Dwarf Rune Stone 	Dwarven Bone Pile 	Critical chance increased by 5%
Zul'Aman 	Troll Tablet 	Voodoo Pile 	Chance on dealing damage or healing to summon an Amani Bear Cub to assist in combat
Zul'Gurub 	Troll Tablet 	Voodoo Pile 	Chance on dealing damage or healing to summon a Young Gurubashi Raptor to assist in combat
==Trivia==
*The Keystone is a type of artifact in StarCraft II.
==Patch changes==
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==See also==
*Archaeology Fragment
Category:Archaeology