If more than 3 stacks of Crystal Shrapnel are consumed when using Ceremonial Crystalshot, each stack consumed beyond the first 3 increases the CRIT DMG of that Ceremonial Crystalshot by 45%, and any stacks consumed beyond the first 3 are returned to Navia.
level a chara to 100 would be a ridiculous waste of resources yet, still better than wasting your ...