Revived

by the way, if it's not too much trouble, do you have a screenshot of Kolyan's army before the battle with the Bishop? Was Light magic useful in the battle against him?

The only Light magic spell that was useful in the battle with the Bishop was teleportation. I used it to pull vampires out from under the attack of the Crusaders after the attack and to block the monks' shooting. The rest was the standard set of necromancer spells: Banshee's Wail, Blood Drain, and Resurrection. It also wasn't possible to use Darkness magic effectively - Nikola is a weak mage (only level 18, with poor magic and knowledge skills, and he doesn't have any special artifacts that increase his magical abilities), and he wasn't developed in the way I would develop a classic necromancer. So, I had to rely on his specialization - vampires - in battles.

Unfortunately, I didn't save the battle with the Bishop - there was nothing particularly interesting about it. I'll check if I have any saves left, replay it, and post it.

Added 1 hour 14 minutes ago
Also, if you resurrect Dunkin not in the tavern, but in the castle, and give him the opportunity to use all the accumulated arsenal of the castle after the resurrection, the battle with him will be much more difficult, even more difficult than the battle with the Green Gate, not to mention the Orange Gate, demons, and the Bishop.