Pet
Cosmic Skeleton Boss in Steal an Egg
Cosmic Skeleton Boss is a Secret-rarity pet from the Cosmic zone in Steal an Egg, hatched from the Cosmic Skeleton Boss Egg, with a listed base income of $45M/s.
| Rarity | Secret |
|---|---|
| Zone | Cosmic |
| Egg | Cosmic Skeleton Boss Egg |
| Income | $45M/s |
| Hatch reward | +1.6m Speed, $4.5b |
| Grow time | 2h 30m |
| Zone speed needed | 700M |
| Zone guardian | Cosmic Skeleton |
| Wiki data as of | 2026-09-04 |
Cosmic Skeleton Boss (Secret rarity) belongs to the Cosmic zone. Cosmic is zone 9 of 12 on the wiki's Biomes list; the wiki lists its entry requirement as 700M speed, and the nests there are watched by the Cosmic Skeleton. You get it by carrying the Cosmic Skeleton Boss Egg back to your pen.
At $45M/s base income, Cosmic Skeleton Boss sits 4th out of 8 in its zone — Unicorn tops the Cosmic at $1B/s. The listed figure assumes no mutation and a normal weight.
With a colour mutation and no size bonus, the same Cosmic Skeleton Boss would earn roughly: Silver ×1.2 ≈ $54M/s, Golden ×2.5 ≈ $112.5M/s, Rainbow ×3.5 ≈ $157.5M/s (multipliers from the wiki's Mutations page; arithmetic is ours). Add a Giant (×3) or Huge (×5) size roll on top and the numbers multiply again.
Hatching it pays a one-off reward of +1.6m Speed, $4.5b, and the egg takes 2h 30m to grow in the pen. That reward is the reason low-income eggs are still worth stealing early: the speed bonus is what gets you into the next zone.
Secret rarity is the badge tier: only 3.4 % of players had earned the 'Hatched Secret!' badge on 2026-09-13 (Roblox badge statistics).
A mutated or oversized Cosmic Skeleton Boss earns a multiple of its $45M/s base. Pick Cosmic Skeleton Boss in the Steal an Egg calculator to apply the wiki's mutation and size multipliers.
Sources & further reading
Other pets
- Unicorn
Unicorn is a Divine-rarity pet from the Cosmic zone in Steal an Egg, hatched from the Unicorn Egg, with a listed base income of $1B/s.
- Eternal Lunar Dragon
Eternal Lunar Dragon is an Eternal-rarity pet from the Cosmic zone in Steal an Egg, hatched from the Eternal Lunar Dragon Egg, with a listed base income of $250M/s.
- Cosmic Dragon
Cosmic Dragon is a Secret-rarity pet from the Cosmic zone in Steal an Egg, hatched from the Cosmic Dragon Egg, with a listed base income of $60M/s.
- La Vacca Saturno Saturnita
La Vacca Saturno Saturnita is a Cosmic-rarity pet from the Cosmic zone in Steal an Egg, hatched from the La Vacca Saturno Saturnita Egg, with a listed base income of $2.2M/s.
- Cosmic Gorilla
Cosmic Gorilla is a Mythic-rarity pet from the Cosmic zone in Steal an Egg, hatched from the Cosmic Gorilla Egg, with a listed base income of $180K/s.
- Cosmic Gecko
Cosmic Gecko is a Legendary-rarity pet from the Cosmic zone in Steal an Egg, hatched from the Cosmic Gecko Egg, with a listed base income of $30K/s.
Pet names, rarities, zones, incomes, rewards and grow times derive from the Steal An Egg Wiki on Fandom, licensed CC BY-SA 3.0; this table is shared under the same licence. Read 2026-10-12; 19 pets added from Module:Pets/Data on 2026-10-22; Bone Emperor added from it on 2026-10-24; 67 pets added from rev 2636 on 2026-10-25. https://www.fandom.com/licensing
All pets: All Steal an Egg pets. Back to the Steal an Egg Hub home page.
Sukie · Editor
Sukie is the editor of Steal an Egg Hub and writes and edits its guides, pet tables and calculators. The work centres on turning the game's published numbers into plain answers players can check: every page names its sources and the date they were read, and anything the sources do not state is left out rather than guessed. Corrections sent through the contact page are read and acted on.
Everything Sukie has written · About this site · How pages are checked · Last updated September 12, 2026
Steal an Egg Hub is an unofficial fan site. It is not affiliated with, endorsed by or associated with the 'and Collect Rare Pets' group or Roblox Corporation. Game names, images and trademarks belong to their owners.