Zardnaar
Legend
Targets INT saves. That's autofail for quite a lot of things in the Monster Manual.
And in a boss fight - since there is a good chance you know their name, you can cower behind a wall of force or other place of total safety and wear them down.
Can be twinned.
Hmmn maybe. Haven't seen it used.
It did stand out for not being level 8. Think I like it more than Banishment.