Places of power assault battle tier 2, difficulty is perfectly tuned

There's another event that will have the extra challenges in "Secrets and Shadows: Assault Battles," if you look in the rewards and you'll see XII finishers and relic materials got included as well.

I doubt I'll manage to finish the mythic and challenge 1 easily as my Nightsisters and Phoenix teams aren't geared up that much, with zero zetas applied.