Iron Wall
As a Bonus Action, you can expend one Battle Die to fortify yourself. The next time you are hit by an attack within the next minute, roll the Battle Die and add the number rolled to your AC against this attack, potentially causing it to miss. This effect ends early if you have the Incapacitated condition. You must be wearing Heavy armor to use this maneuver.
Sources
Valda’s Spire of Secrets Extras (2024)