normal hollow
One thing I was thinking about involving the Forge is that we can, for example, farm certain resources from the crits themselves, like some relics are already crit materials, so we can use them (not the relics) to craft specific items. One example is the level-up patches, which could be crafted with these resources but are subject to a monthly limit. We could also have craftable hammers that require legendary crit resources. If specific resources like Cubsprout leaves or Drilldents claws aren't used, then something like elemental essences could be used instead, separated by rarity just like the crits. You could only forge the hammers with all six legendary elemental essences, and only one per month.
upper spade
indigo frost
meager iris