Schema Stone Key Item

Auto Build: Bridge

Dirigible.

Defeat the Yiga Soliders (x3) that are disguised as a Researcher to access the Steward Construct who will then reward you with a Schema Stone.

Once you have Autobuild from the Depths, speak to the Construct to obtain this. It will teach you the Beam Cycle recipe.

Talk to the Steward Construct after defeat Master Kohga in part 2 of Master Kohga of the Yiga Clan. Schema: Hovercraft

For defeating Master Kohga a third time talk to the Steward Construct to receive a Schema Stone. The plan is a Bolt Boat.

After defeating Master Kohga, one of the Constructs at the mine will speak to you and tell you about Kohga’s next destination. It will also point out another Construct at the same mine, so go ahead and activate that one to get the Fanplane Schema Stone.

Locate the Construct and activate it to receive the Instant Scaffold Schema Stone.

Speak to the Construct to get the Instant Cannon Schema Stone.

Speak with the one Construct to receive the “Rocket” Platform Schema Stone.

Locate the Construct to get the Automated Ally Schema Stone.