Poison: Tainted Keystone
Poison: Tainted Keystone (26)
Aside from miners trying to earn a living, the true evil rotting at the core of Stonefield were the rocks holding up doorways.

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Stats
This is a Poison artifact set containing 7 artifacts
The difficulty level for completing this set is Moderate.
Source:
Mathosia > Stonefield
These Poison artifacts are picked up in Stonefield while you have the Poison Artifact Sight Buff. Once the buff is active, you will see the artifacts as green shinys on the floor.
This set can be found inside artifact caches, looted from minion missions, or rewarded from the daily/weekly gifts
Rewards:
The Basic Loot Chest: Faded Cache
Credits the Cheevo:
Poison Stonefield
Artifacts in this set:
Freaky Black Light
Harrow Hideaway
Gregori's Hand Prints
Economies of Evil
Gem Settings
Gravity Powered Necromancy
Thorne in Arthur's Side
Harrow Hideaway
Gregori's Hand Prints
Economies of Evil
Gem Settings
Gravity Powered Necromancy
Thorne in Arthur's Side
For a full list of collectible artifacts you can visit the Artifacts List.