Sovereign : Frostveil

One in a billion is the headline: Sovereign : Frostveil was rolled at 1 in 1,000,000,000 as a breakthrough and 1 in 500,000,000 in the Aurora biome, which is 500 million rolls even in the best weather at 1x luck and 50 million at 10x. It was the rarest of the Christmas 2025 additions, the event has ended, and the wiki lists it as unobtainable. Eon 1-13 is the version tied to it. Four creators share the credit: em0ji_9, CreativeAbility, V1V1D_17 and onlyyxyyz.

It reimagines Sovereign as an aurora borealis scene, larger than the original. The throne turns into a sleigh with antler-like structures on top and a sack of presents at the back, a grey sphere near the middle reads as a reindeer's nose, and the orb above is dark where Sovereign's is light blue. Eight blue and gold hexagonal ornaments replace the original arrows, rotating counter-clockwise, with two eight-pointed stars on top, the larger one clockwise. The in-game text only says it matches the Sovereign lore for now. No active ability.