Since One Tamriel there are three new sets that drop in all Trials in Craglorn, that are a direct downgrade of the previously already released sets Vicious Ophidian, Infallible Aether and Eternal Warrior.

See the Comparison between Eternal Warrior...
(2 items) Adds 4% Healing Taken
(3) Gain Minor Aegis at all times, reducing your damage taken from Dungeon and Trial Monsters by 5%.
(4 items) Adds 1064 Max Health
(5 items) When you die, you instead turn into a statue for 3 seconds and gain 200 Ultimate. While a statue you are immune to all negative effects but can still be healed. This effect can occur once every 10 minutes. Adds 4% Healing Taken

... and Immortal Warrior.
(2 items) Adds 4% Healing Taken
(3 items) Adds 1064 Max Health
(4 items) Adds 4% Healing Taken
(5 items) When you die, you instead turn into a statue for 3 seconds. While a statue, you are immune to all negative effects, but can still be healed. This effect can occur once every 20 minutes.

And between Vicious Ophidian...
(2 items) Adds 688 Weapon Critical
(3 items) Gain Minor Slayer at all times, increasing your damage done to Dungeon and Trial Monsters by 5%.
(4 items) Adds 688 Weapon Critical
(5 items) Reduces the cost of your Stamina abilities by 8%.
When you kill an enemy, you restore 2150 Stamina and gain Major Expedition for 20 seconds, increasing your Movement Speed by 30%. Adds 129 Weapon Damage

... and Quick Serpent.
(2 items) Adds 688 Weapon Critical
(3 items) Adds 967 Max Stamina
(4 items) Adds 967 Max Stamina
(5 items) Reduces the cost of Stamina abilities by 8%. When you kill an enemy, you gain Major Expedition for 20 seconds, increasing your Movement Speed by 30%.

And finally between Infallible Mage...
(2 items) Adds 688 Spell Critical
(3 items) Gain Minor Slayer at all times, increasing your damage done to Dungeon and Trial Monsters by 5%.
(4 items) Adds 129 Spell Damage
(5 items) Your fully charged heavy attacks do an additional 903 damage.
Enemies you damage with fully charged Heavy Attacks are afflicted with Minor Vulnerability for 10 seconds, increasing their damage taken by 8%. Adds 688 Spell Critical

... and Wise Mage.
(2 items) Adds 688 Spell Critical
(3 items) Adds 688 Spell Critical
(4 items) Adds 129 Spell Damage
(5 items) Enemies you damage with fully-charged Heavy Attacks are afflicted with Minor Vulnerability for 10 seconds, increasing their damage taken by 8%.

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Why are these sets ingame and blocking a drop that could've been the already ingame set.
Why not doing a completely new set instead of just including a low-grade substitute?