Calidor Awakened
Ultra rare0.7%StoryAnywhere
Solve the Gateway Engine on Calidor.
Calidor's chambers want 12U/s for 30 seconds. The engine asks for Explosive Powder: 2 Carbon + 1 Sulfur in the Chemistry Lab, and conveniently Calidor's own atmosphere is the best Sulfur source. Make it before you descend (or take a packaged lab), then the usual: powder into the platform, carry the triptych to the opposite slot, engine lit.