Red Full Moon

You cannot roll Red Full Moon. The Sol's RNG Wiki calls it a developer-exclusive aura, unobtainable from rolling, and the entry has no real rarity, so there are no odds to turn into expected rolls. Its description says it is chaos, the origin and source of all unstable existence from the primordial world.

What makes it worth a page is how often other auras cite it. Pythios and Memory are compared to its halos, and its look explains why: a ring of horizontal spikes that behaves like an audio visualizer, a large eight-pointed red spike (four long, four short) with two halo-like rings and a dark red star inside, smoke rising from the feet, and a leaning pose with the left hand on the head. Equipping it plays a short animation in which a red orb falls, explodes into red slashes, cracks the floor and rings a bell.

It has five developer-only abilities, mostly large red area attacks that kill players in range. 53_Axis is credited, and the song is Throwback by Derpcat.