Go to the Impassable Greatbridge side of Caelid, then cross the bridge toward Redmane Castle. The easiest path is to use the lift/teleporter route mentioned in guides, which takes you into the castle area where the secret boss setup happens.

Route in the castle

  1. Enter the castle and keep moving through the main courtyard area.
  2. Head to the chapel side and then take the eastern door.
  3. Ride the lift down to the lower area.
  4. Use the waygate/teleporter in the water to get to the boss arena.

Boss access note

Before the festival state, Redmane Castle can have the Misbegotten Warrior and Crucible Knight encounter inside the castle, and once the festival is active, the area changes so the Radahn fight becomes accessible through the teleporter route.

What to watch for

  • The bridge into the castle is guarded, so expect heavy ranged fire on approach.
  • If you just want the boss, follow the interior path rather than exploring every side room.
  • Guides also note that the castle entrance and boss access can change depending on story progression.

Redmane Castle’s “secret boss” route is basically: reach the castle, go through the chapel/lift path, then take the teleporter into the arena.