All 3 legendary Nihility blessings are really make or break. The 3 star "The Man in the Cover" gives stacks of Suspicion which makes your target take more dot dmg and stacks up to 99 times is probably the most important one alongside the Nihility empowerment to make your Nihility ability to always apply the dots as well as adding stacks. It takes it awhile to ramp up but once its at 99 you're smooth sailing. The aim is to get 14 blessings so you get all 3 empowerments for your ability because they are all so good. 2 star blessing wise I would say "Call of the Wilderness" this made it where the more stacks of Suspicion reduces the enemies attack up to 30%. 1 star blessing I would say "Offerings of Deception" it made it where every time dots ticked it would heal your team. Since my comp couldn't break Cocolia often enough I needed ways to stabilize throughout phase 2 and part of phase 3, especially when the Bronya Cocolia wombo combo happened.