Once Moreau falls in the drained arena, Ethan climbs an elevator back toward the surface. The path splits before reaching the Duke's merchant wagon. Instead of exiting straight to the central village altar, inspect the roadway adjacent to the first windmill where you initially tried to power the sluice gate.
To the right of the path stands a padlocked wooden gate framed by iron mechanics. Slot the Mechanical Crank into the apparatus. Turning the winch pulls open the gate, unmasking an elevated cliff path designated on the map as Moreau's Lab. This area is completely optional. The primary narrative never points an objective marker here, leaving it hidden for thorough explorers.
The trail winds upward toward three dilapidated huts perched above the canyon. Winged horrors known as Samcas patrol the canopy above. Pick them off with the F2 Rifle from long range rather than letting them swarm you on the narrow footpath. Check the ruined shrines along the ledge; they contain valuable crafting materials and sniper rounds that soften the logistical blow of the upcoming fight.
