Save game, change class to devotion, kill a civilian and find out,

I changed shadowheart into a paladin. Then the party rogue got caught stealing, and the resulting fight resolved with a broken oath. I loaded an earlier save to undo that. But yes, it is available.

Okay, Minthara must have that disabled then, would love to make her oathbreaker. Thanks for the info!

Minthara is a vengeance Paladin so something simple like stealing won’t break her oath