Griefberg Castle is Brencis’s stronghold — the finale location of The Blood of Dawnwalker, where the war that has driven the whole run comes to a head. This page contains full spoilers.
What it is
The seat of Brencis, the top of the war machine (with Ambrus, Bakir, and Xanthe running the field underneath him). Every vassal arc and ally chain in the world guide ultimately points toward this location.
Why it matters
The finale
Phase 1 of the Brencis fight happens here — a wraith-summoning crowd fight: Brencis raises the dead and you fight through the resulting horde before the duel proper.
Point of no return: night-traversal through the castle triggers an ending warning — from that point, a standard run cannot be turned back. If you still have uncompleted ally chains or story beats you want, they happen before you commit to the night traversal into the castle.
Practical planning: keep a day buffer before the finale, and treat the 30-day timer as the hard constraint on what can still be finished in time. The first-act walkthrough covers the run’s structure up to the endgame.