Deadly Lover’s Fortress — Sker Ritual

Gate, ram, chalice, forge

Use the castle-gate winch, drop Balor, then shoot four generators that each want their skyborne power source destroyed first. Balor returns. Gather four oil pots for the battering ram, light a torch in Balor’s flame, pull the dragon lever, and take the portal to the banqueting hall and the cloning lab. After the head and the teleport fuel, the factory door is a kill gate. Grab the chalice at the end, escort a Quiet One from the middle dungeon cell to the metal platform, throw the switches along the red line, and repeat the blood basins three times.

• After Balor the Undying, the strange box at spawn wants every wall symbol turned green. Clone Abraham drops the sword.
• The sword opens the door by Lucky’s box. Open the forge and turn every valve on a timer.
• Three explosive parts sit behind dungeon doors. The third spawns clone Isaac. You can fight Elisabeth or forge Shattered Edge first. The guides say both are available.
• Four heads open the door. At 66% and 33% Elisabeth shields. Kill Thomas to break it.

Cloning Lab codes and the final door

The Steam guide records three Cloning Lab strings: Circle–Diamond–Triangle–Circle; Square–Square–Circle–Triangle; Square–Diamond–Square–Triangle. Check the three chalkboards in the current match before entering them. The final vial triggers the King of the Rats; collect The Stranger’s Head and teleport fuel afterward.

After the forge and explosive-parts route, place four heads at the final door. During Elisabeth’s fight, defeat Thomas when she becomes shielded so damage can resume. The guide places those shield phases near two-thirds and one-third health; use the visible shield rather than treating percentages as a guaranteed damage breakpoint.

Seal

The purple machine starts the seal: four Stranger marks, a purple chest and black sheep to the factory, Abraham plus Isaac, five hanging corpses shot with Shattered Edge at the bio-pod, then the King of the Rats and Balor the Undying. A purple lantern and four cell symbols feed the dungeon lab. Place the seal in the lover’s chamber and fight Elisabeth with the cloned bosses in the room.

Seal completion and separate collections

After the purple machine and four Stranger appearances, open the purple chest at the end of Dungeon Hallway. Escort the sheep to The Factory and defeat Abraham and Isaac. Interact with the spawn Bio-Pod, shoot five hanging corpses with Shattered Edge, interact again and defeat the King of the Rats and Balor the Undying.

Take the purple lantern from Dungeon Hallway. Reveal four purple symbols in Dungeon Cells and record their cell numbers; arrange the sequence in Dungeon Lab to obtain the seal. Place it in Lover’s Chamber and finish the harder Elisabeth encounter. The collectible achievements remain separate: Maids of the Fortress for dolls and Love Letters for notes. The Fortress music route uses Ice Knights and red torches.

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