Best way right nowCosmic Skeleton Boss Egg
Steal a Cosmic Skeleton Boss Egg from the nests in the Cosmic biome (they refill every 5 minutes) or from another player's base, then hatch it in your pen. It takes 2h 30m to hatch.
SecretPets#73 of 194
Cosmic Skeleton Boss
Normal base income45M/s
Mutation
Details
- Found in
- Cosmic
- Hatch time
- 2h 30m
- Rarity
- Secret 8/11
- Category
- Pets
- Normal weight
- 1,000 kg
- Last updated
- 3 days ago
- Source
- Steal An Egg Wiki · Cosmic Skeleton Boss
Cosmic Skeleton Boss by weight
Type your own kg →Normal1,000 kg45M/s
2x2,000 kg69M/s
10x10,000 kg186M/s
50x50,000 kg502M/s
125x125,000 kg884M/s
500x500,000 kg1.54B/s
Income by weight before any colour mutation. Growth slows past 125x the normal weight.
Base income history
- Change · All
- -
- High
- -
- Low
- -
- Now
- -
Value changes
No changes since we started tracking on Sep 28, 2026. When Steal An Egg buffs or nerfs Cosmic Skeleton Boss, it shows up here.
What is Cosmic Skeleton Boss in Steal An Egg?
Cosmic Skeleton Boss is a Secret pet in Steal An Egg. Its base income is 45M/s, 73rd of 194 pets we track and 26th among 38 Secret ones. It hatches from the Cosmic Skeleton Boss Egg in 2h 30m, found in the Cosmic biome.
- Rarity
- Secret
- Pet
- Pets
- Base income
- 45M/s
- Rank
- #73 of 194
- Hatch time
- 2h 30m
- Egg
- Cosmic Skeleton Boss Egg
- Index reward
- +1.6m Speed, $4.5b
How to get Cosmic Skeleton Boss
Related: 
Unicorn
Eternal Lunar Dragon
Cosmic Dragon
La Vacca Saturno Saturnita
Where this comes from
Built from our Steal An Egg data, checked 2026-10-04, using the sources below.
Wikis
- Steal An Egg Wiki · Cosmic Skeleton Boss
- stealaneggwiki.com all eggs (income + hatch time)
- stealaneggwiki.net eggs (income + index reward)
- robloxgameswiki all pets (rarity bands and counts)
- Item images: stealanegg.fandom.com (fan wiki). Game art belongs to the developer.
Steal An Egg Wiki · Cosmic Skeleton Boss is licensed CC BY-SA 3.0. Game content and images belong to the game's developer. We are not affiliated with Roblox or the developer.
How Cosmic Skeleton Boss compares
Similar Secret pets
All Steal An Egg values →Secret
Mecha Scorpio
45M/sBase income
- Found in
- Monster Egg (Robux shop)
- Hatch time
- 10s
- Egg chance
- 1% Mecha modifier
Scorched Dragon
35M/sBase income
- Found in
- Event (Dragon)
- Hatch time
- -
- Egg chance
- -
Cosmic Dragon
60M/sBase income
- Found in
- Cosmic
- Hatch time
- 3h
- Egg chance
- -
Mawbreaker
60M/sBase income
- Found in
- Rift Machine
- Hatch time
- -
- Egg chance
- 4%
Tralaledon
32M/sBase income
- Found in
- Prehistoric
- Hatch time
- 3h
- Egg chance
- -
Questions about Cosmic Skeleton Boss
How much is Cosmic Skeleton Boss worth in Steal An Egg?
Cosmic Skeleton Boss has a base income of 45M/s, which ranks it #73 of 194 in Steal An Egg. Silver 1.2x: 54M/s, Bloom 1.25x: 56.3M/s.
How rare is Cosmic Skeleton Boss?
Cosmic Skeleton Boss is a Secret pet, tier 8 of 11.
Is Mawbreaker better than Cosmic Skeleton Boss?
By base income, yes: Mawbreaker is 60M/s, about 1.3 times Cosmic Skeleton Boss's 45M/s.
How do you get Cosmic Skeleton Boss in Steal An Egg?
Cosmic Skeleton Boss Egg: Steal a Cosmic Skeleton Boss Egg from the nests in the Cosmic biome (they refill every 5 minutes) or from another player's base, then hatch it in your pen. It takes 2h 30m to hatch.
How much does Cosmic Skeleton Boss weigh in Steal An Egg?
A normal Cosmic Skeleton Boss weighs 1,000 kg. Heavier ones earn more: at 10,000 kg (10x) it makes about 186M/s, and at 125,000 kg (125x) about 884M/s, before colour.
Community data from the Steal An Egg Fandom wiki and several fan sites, which disagree on a few pets (noted on their pages). Four Extinction Egg animals (Terrorbird, Giant Sloth, Dunkleosteus, Gigantus) will be added once their base income is published; their Skeletal versions are listed.