Philosopher's Stone: Revelation

What it’s for

It’s the step that comes after Soul Binding. When a piece reaches 100% binding (the one you raise with Sync, which is what weapons like the Rupture Rod are for), Soul Fuse adds a new power to it.

According to the guides: each Soul Fuse costs 2 of these stones and 1,000,000 Kina. It always succeeds, and the power doesn’t carry over to another piece if you change gear.

Where it drops

Metabot doesn’t list any source yet for the version seen in the global client. When I see it in game, I’ll note it here.