Died to Floor 4 Boss of trial with Moment's Peace active

I died to Floor 4 Boss of Trial of the Sekhemas while I had the Boon Moment's Peace active, which states that I cannot be damaged until the next room is completed.

The spinning lightning tendril attack killed me where he summons time freezing spheres. If I understand correctly it shouldn't be possible to take damage. If that applies only to Honour it should be stated in the boon description.

I don't know if other attacks do damage to me or if I just dodged them.

https://imgur.com/a/994pIF2

img link didn't work in post

Just had this happen to me, it seemed like I was invulnerable until that lightning turret phase, then it seemed like I lost it.

This happened to my party after further investigation it was the (Lost 5% energy shield, life and mana when hit) affliction that killed us.