Pet
Cosmic Skeleton Boss
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 11 on the normal route; 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).
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 a 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 2026-09-13. https://www.fandom.com/licensing
All pets: All Steal an Egg pets. Back to the Steal an Egg Hub home page.
Sukie · Editor
Sukie runs Steal an Egg Hub. Every pet, egg, zone and mutation on the site is checked against the Steal An Egg Wiki's infoboxes and the official Roblox game data before it is published, with the date it was read; anything the sources do not state is marked as not published rather than guessed.
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