The Third Nightmare
The Third Nightmare (60)
Artifacts found in Nightmare III rifts.

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Stats
This is a Normal artifact set containing 12 artifacts
The difficulty level for completing this set is Moderate.
Source:
Planar > Nightmare
These artifacts can be found inside Nightmare Caches. These Caches are awarded to you every 10 levels of a Nightmare Rift.
The nightmare artifacts that you get from the caches are completely random, for instance: you do not need to do a NMR4 to get the NMR4 artifacts, they will drop from any of the NMRs.
This set is NOT known to be found inside artifact caches, looted from minion missions, or rewarded from the daily/weekly gifts
Rewards:
The Basic Loot Chest: A Hefty Dream Crate
The Special Loot Chest: Planar Air Dimensional Chest
The Dimension Item: Nightmare Rift Maw Arch
Credits the Cheevo:
Nightmare III: Artifacts
Artifacts in this set:
Tamuskal's War Horn
Broekoof's Slag Totem
Lexanon's Last Meal
Zebrayan's Spoils of War
Bastzath's Essence
Shadimir's Spectral Guise
Valeos's Earthen Cleaver
Tautivak's Adamantine Armgaurd
Husaro's Mutated Claw
Napotag's Leafblade Scales
Tsathtosa's Detached Mandible
Tivadar's Phantasmic Cowl
Broekoof's Slag Totem
Lexanon's Last Meal
Zebrayan's Spoils of War
Bastzath's Essence
Shadimir's Spectral Guise
Valeos's Earthen Cleaver
Tautivak's Adamantine Armgaurd
Husaro's Mutated Claw
Napotag's Leafblade Scales
Tsathtosa's Detached Mandible
Tivadar's Phantasmic Cowl
For a full list of collectible artifacts you can visit the Artifacts List.