The Underworld Egg shipped Sep 17 β the only late egg with an official route statement
- A 15th badge, The Underworld Egg, appeared in the official Badge API on Sep 17, 2026 (23:44 UTC) β the fourth egg added after launch, after Celestial (Aug 30), Eternal (Sep 1) and Savannah (Sep 4).
- Its badge description is the first official route text for any late egg: βCarried an egg out of The Underworld and back across Start.β The nest sits in The Underworld and the run ends back at Start, so it is a long carry rather than a short per-biome loop.
- Hatch pace: 351,147 awards by Oct 27, with ~1,300 in the last 24 hours β the busiest of the four late eggs, ahead of Savannah (1,764/day headline rate but a smaller total base) and far ahead of the flattened Eternal Egg (~+32/day).
- Guardian species, egg price, animal pool and rarity tier are still unconfirmed in footage, so the egg is tracked in the new eggs section of the animal index rather than as a full roster entry.
Listed in the patch tracker Β· see the dated source trail below.



