Nebula Fragment

This is the mage material. The armor built from it drops colored boosters off things you kill, and walking over them stacks damage, mana regen, life regen or speed until you stop killing. That changes how a fight plays: instead of holding maximum range you have to keep moving into the space where the enemies died, because a full damage stack is worth more than any single accessory you could swap in. Lose the rhythm and you are wearing an ordinary armor set.

One pillar does not fund the armor plus the weapons plus the wings. Plan on running the event more than once and killing Moon Lord in between for the bar half of every recipe. If you finish a run sitting on a heap of the wrong color, the Ancient Manipulator converts fragments in both directions, so a solar-heavy haul can still be turned into a mage kit without another pillar fight.