Secret · Cosmic
Cosmic Skeleton Bossin Steal An Egg
$45M/second
Single source — not independently confirmed
Sources · checked 2026-08-27
Single-source (Eldorado pet index). Twelve values spanning every rarity tier were checked against independent sources and matched exactly, so the index is likely accurate — but this specific figure has not been independently confirmed.
- Overall
- #12/80
- In Secret
- #3/10
- In biome
- #4/8
Income with every mutation
Mutations multiply base income, so the same mutation is worth wildly different amounts on different pets. Here is what each one is actually worth on Cosmic Skeleton Boss.
| Mutation | Multiplier | Income / sec | Gain |
|---|---|---|---|
| None | 1× | $45M | — |
| Silver | 1.25× | $56.3M | +$11.3M |
| Bloom | 1.5× | $67.5M | +$22.5M |
| Golden | 2× | $90M | +$45M |
| Rainbow | 2.5× | $113M | +$67.5M |
| Spirit Bloom | 3× | $135M | +$90M |
Size stacks on top of these. Full mutation sourcing is on the mutations page, and the income calculator lets you combine both.
How to get Cosmic Skeleton Boss
Cosmic Skeleton Boss hatches from eggs stolen in the Cosmic biome. That biome needs 700M Speed to enter, and the Dragon patrols it.
The listed requirement is an entry floor, not a safe margin. Guardians chase, and carrying a large egg slows you down on the way home, so aim for roughly 1.8B before attempting a real run. Work out how long that takes from your current Speed →
Where it sits
Cosmic Skeleton Boss earns 45.0 million times what the weakest pet in the game does, and ranks #12 of 80 pets with a published income figure. The next pet up is Cosmic Dragon at $60M/s. Directly below it is Tralaledon at $32M/s.
Every size and mutation combination
Two Cosmic Skeleton Boss are almost never worth the same amount. Size and mutation stack, so the spread between the worst and best version of this one pet runs from $33.8M/s to $270M/s — a factor of 8.
| Size | None | Silver | Bloom | Golden | Rainbow | Spirit Bloom |
|---|---|---|---|---|---|---|
| Tiny0.75× | $33.8M | $42.2M | $50.6M | $67.5M | $84.4M | $101M |
| Normal1× | $45M | $56.3M | $67.5M | $90M | $113M | $135M |
| Large1.5× | $67.5M | $84.4M | $101M | $135M | $169M | $203M |
| Huge2× | $90M | $113M | $135M | $180M | $225M | $270M |
Mutation multipliers are sourced and listed on the mutations page. The size multipliers are approximations — the game confirms larger pets earn more but does not publish the curve, so treat the size axis as a comparison aid rather than exact figures. This is the same caveat that applies everywhere on this site: where we are estimating, we say so.
How fast Cosmic Skeleton Boss pays for things
Income only matters relative to what you are saving for. Running one unmutated Cosmic Skeleton Boss at default size, and nothing else:
| To bank | Takes | Roughly |
|---|---|---|
| $1B | 22 seconds | instant in practice |
| $1T | 6 hours 10 minutes | inside a day of idle time |
Pets earn while you are offline, so these are wall-clock times rather than play time. A full pen multiplies them down — put your actual line-up into the income calculator for the real figure.
Every Secret pet compared
Rarity is a poor guide to income on its own — the Secret band alone spans $3.5M/s to $145M/s. Here is where Cosmic Skeleton Boss actually sits among them.
| # | Pet | Found in | Income / sec |
|---|---|---|---|
| 1 | Stag | Cherry Blossom | $145M |
| 2 | Cosmic Dragon | Cosmic | $60M |
| 3 | Cosmic Skeleton Boss — this pet | Cosmic | $45M |
| 4 | Tralaledon | Prehistoric | $32M |
| 5 | T-Rex | Prehistoric | $25M |
| 6 | Kraken | Abyss Ocean | $15M |
| 7 | Cerberus | Volcano | $8M |
| 8 | Yeti | Snow | $5M |
| 9 | King Snake | Jungle | $3.5M |
Cosmic Skeleton Boss sits 3 of 9 in this band — $145M/s separates the top of the tier from the bottom. The tier list ranks every pet by income regardless of rarity, which is usually the more useful ordering.
Other Cosmic pets
Cosmic Skeleton Boss FAQ
How much does Cosmic Skeleton Boss earn in Steal An Egg?
Cosmic Skeleton Boss earns $45M per second at default size with no mutation. A Spirit Bloom mutation takes that to $135M/s.
Where do you get Cosmic Skeleton Boss?
By stealing eggs from the Cosmic biome, which needs 700M Speed to enter and is patrolled by the Dragon.
Is Cosmic Skeleton Boss a good pet?
It ranks #12 of 80 pets by income, and #3 of 10 among Secret pets. It earns roughly 45.0 million times what the weakest pet in the game does.
Where this data comes from
Single-source (Eldorado pet index). Twelve values spanning every rarity tier were checked against independent sources and matched exactly, so the index is likely accurate — but this specific figure has not been independently confirmed.
Last checked 2026-08-27. Steal An Egg updates every Saturday — if this figure does not match what you see in-game, tell us and we will correct it with your observation credited.