No Highguard Boss Sacrifice Recipe
Theres no recipe for Gregor Valench (HighguardBoss) or his ghost version (HighguardGhostBoss), from what I can see.
Game Version:
Steam Public
Platform:
Windows
Atsakymai 2
Gregor was simply too boring for us to create a non-campaign version of him, so he doesn't have a sacrifice recipe.
The ghost version however does exist :)