Aether Fuses?

So the Aether Fuse item that we need for the secondary potential on Yamato weapons, I assume he don't have those yet? Where do they drop in the future?

If JPN precedent is followed, they will only drop from XH on the boosted version of Yamato, if I recall correctly.

ah, wonder when we'll get that then.

It came after the final story raid boss for ep4 on JP.