500 RUNE CAP
I understand that it is a technical prob to make the 500 rune max higher. But there are other ways to handle this prob:
Just delete the +3 initial for fuse runes 1* to 3* and we can reduce the runes without greater prob.
Gave us a new shrine which can add a primary and secondary bonus from an other rune.
1 runeoffering set
1 runeoffering place
1 Rune with primary and/or secondary bonus
So it rerolls only the tertiary and change the place/set.