Borealis

Borealis is the Dreamspace aura nobody rolls by accident. The wiki lists it as Challenged tier, added in Eon 1-14, with a single route: 1 in 13,333,333 while Dreamspace is active, and no chance outside that biome. At 1x luck that means roughly 13.3 million rolls spent inside Dreamspace, and about 1.3 million at 10x. Since the biome itself is rare, the real cost is in waiting for the right weather.

Its description field just says Empty. What it does have is a pink theme shared with the other Dreamspace auras: a sparkling pink aurora above the player, stars hanging from thin strings, rotating pink mist and a glow rising from below. The player floats with limbs spread and the face hidden behind a horizontal blur. The wiki says the base effect resembles Abyssal Hunter and Lantern, recolored and slowed down. The creator is blwy2, and the next aura in the wiki order is Dreammetric.