This was my second Walkthrough of this map (now I understand that I need to play it again for the 3rd time). And when I played the map for the first time, there was a glitch. I didn't collect the Dwarf artifacts and didn't go to the prophet at all, but I killed all the Necromancers along with Nicholas, and he disappeared from the map and stopped appearing
Added 4 minutes later
I saw the glitch with my own eyes for the first time. A friend couldn't complete this mission. After he captured the last enemy Castle, the message about the enemy player's turn stopped appearing. Before that, he killed Nicholas once - as expected, a message appeared that he was reborn. My friend didn't see Nicholas again. He disappeared as if he fell through the ground or drowned in the sea. Even after he explored the entire map, the secondary quest to collect artifacts remained unfulfilled. I was also surprised that his units from Nicholas's territory went into the Dungeon. No one dared to go into someone else's zone. I killed Nicholas repeatedly.
for 1.5.