Following a series of expeditions—some successful, others not—into the frigid Siberian tundra, corruption has spread from animals and people to a much larger threat. New heroes, better prepared than their predecessors, gather to face the prospect of a mechanical monster, but the changing landscape brings greater uncertainty as they explore Tunguska with fresh eyes. The Gears of Corruption expansion to Expeditions adds elements of risk and danger in the form of secret bonuses on map tokens and a corrupted mech that roams the land. To counter these threats, the expansion offers 2 new mechs and 4 new character/companion pairs, as well as components for a 6th player. Gears of Corruption also accelerates early gameplay by giving players starting resources and a hero worker that can act as any type of worker. The Gears of Corruption expansion contains plastic mechs and 1 plastic base snap.

• 7 mech mats (2 new mats and 5 dual-layered mats to replace the originals)
• 16 new map tokens (each with a secret bonus on the face-down side)
• 6 hero workers
• 8 starting cards (63x88mm)
• 6 discovery cards (63x88mm)
• 7 mech cards (63x88mm)
• 12 corruption cards and 1 corrupted mech reference card (63x88mm)
• components for a 6th player: power, guile, glory, and action tokens
• 6 silkscreen printed corruption tokens
• a robust Automa solo mode (5 progress cards, 1 corrupted mech reference card, 1 rulebook.