It will be unlocked in 2 years.

Was just added on JP so 2 years later unless they give it early, which I doubt.

Looks like the feature is so new, it didn't even make it to the event page yet 😋

Well, I hope they'll implement it early, as they've done with other updates.

I can now start to seriously aim for bond 15 for some servants and don't have to use lowest bond anymore...