I'm trying to make a super heavy Bey, is there a heavier forge disc than heavy? I remember seeing a beyblade geeks video where there was one, does anyone know?

Quarter is technically heavier, I believe. Gravity for sure is at least as heavy as Heavy.

Quarter is technically heavier, I believe. Gravity for sure is at least as heavy as Heavy.

I can't seem to find quarter anywhere, what Bey does it come with?

B-67 Random Booster Vol. 5. Gigant Gaia has Quarter, but it comes with other Beyblades in that Random Booster.