It is vital to have at least Cleric C2 or Priest C3 heading into the endgame. Even with Priest C3, there is some struggling. Cleric C2 is considered the bottom-line for general support.
It is possible to go Krivis C3 instead of Dievdirby C3 as well as an alternative build. It’s not nearly as strong at bossing, but it is a superior mobbing/grinding build if it’s any consolation.