The Fourth Nightmare
The Fourth Nightmare (60)
Artifacts found in Nightmare IV 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 Ice Chest
The Special Loot Chest: Planar Air Dimensional Chest
The Dimension Item: Nightmare Hand Left
Credits the Cheevo:
Nightmare IV: Artifacts
Artifacts in this set:
Tehbot's Ringlet of the Zephyr
Nahuvinus's Hoarded Loot
Nayelin's Fireborn Lance
Zhaknar's Portal to the Briny Deep
Viragos's Disembodied Pincer
Slatturk's Ferric Mask
Venmar's Noxious Stinger
Ardurlode's Lustral Stiletto
Kneshi's Seed of Regeneration
Endomur's Unhatched Bone Egg
Horassor's Mace of Desecration
Kerakar's Animated Visage
Nahuvinus's Hoarded Loot
Nayelin's Fireborn Lance
Zhaknar's Portal to the Briny Deep
Viragos's Disembodied Pincer
Slatturk's Ferric Mask
Venmar's Noxious Stinger
Ardurlode's Lustral Stiletto
Kneshi's Seed of Regeneration
Endomur's Unhatched Bone Egg
Horassor's Mace of Desecration
Kerakar's Animated Visage
For a full list of collectible artifacts you can visit the Artifacts List.