Open up the Stat Migration page, and hover over the '?' in the upper right corner.

Either we're missing half of the Stat Migration system, or our popup is twice as big as it needs to be.

I don't know about anyone else, but I've never run into a crafting recipe for a Stat Migration 'Pendant'.

The only Stat Migration tools I know of are bought in the gen merch/evenbard or honor/arena shops, and all are classified as 'Talismans'.