Stygga Castle is a massive, dark elven fortress hidden deep within a treacherous mountain canyon in the southern reaches of Ebbing. Seized by the rogue sorcerer Vilgefortz of Roggeveen, the castle functions as a high-security citadel and illegal laboratory for horrific biological experiments on the Elder Blood lineage. The fortress layout features labyrinthine underground dungeons, iron-reinforced laboratory chambers, and acts as the grim, tragic setting for the ultimate final confrontation in the original book saga.