But Oaths only come at lvl 3 so you should not have been high enough level to be able to break your oath at this point in the game.
In BG3 patch 9, oath of devotion or oath of the ancients are selected at character creation. Not sure if this will be the same in the full release or if it's just because, with only 5 levels in EA, Larian thought delaying oaths until level 3 wouldn't give people long enough with their fully realised paladin, especially if they wanted to try breaking their oaths.
