I got this unique idea the domain from the nonm astery could come back but I know a way to make it less boring for people to use.
The domain would be like a dual you will be in a arena with swords falling down.
The two players could get swords they could pick the sword for the ability they want
The dual will be fair
And to make it right the swords could damage both of the players when they hit the ground.
This is a idea I think it would make the mastery much funner and unique from other masterys 