The fate of the kingdom.

It's a secret. You can get a hint from the tavern keeper in any city.

In the end, I completed it without him; vampires are just overpowered and can't be countered.
But still, thank you for the answer; next time, I'll try to find out. I also tried jumping through the Astral Gate, but on the week of the Ents, they spawned right at the point I was trying to teleport to.))