Can some one compare and contrast both?
Unstable Clannfear:
Summons a clannfear to attack enemies. Clannfear deals 15% additional damage and can charge and tail swipe nearby enemies. Toggle to activate. Reduces Max Magicka by 10%.
New Effect:
Summons a clannfear with increased health
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Twilight Matriarch:
Summons a Twilight Matriarch to attack nearby enemies. Heals when player's Health drops below 35%, this can only occur once every 30 seconds. Toggle to activate. Reduces Max Magica by 10%.
New Effect:
Heals you when at low health.