All pets
PET
COSMIC SKELETON BOSS EGG
Cosmic Skeleton Boss
Secret
$45M/s
Wiki data synced Oct 24, 2026 · on the wiki since Aug 31, 2026
Base income
$45M/s
Found in
Cosmic
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Drop chance
0.5% (1 in 202)
Base size
1,000 kg
Steal reward
+1.6m Speed, $4.5b
Grow time
2h 30m
STATS
About 1 in 202 eggs that spawn in Cosmic is a Cosmic Skeleton Boss.
140
eggs · 50% chance
464
eggs · 90% chance
Eggs you need to see to get at least one, from the wiki's spawn chances.
HATCH ODDS
Size
Normal
Golden
Rainbow
1,000 kg (base)
$45M/s
$113M/s
$158M/s
10,000 kg
$186M/s
$465M/s
$652M/s
100,000 kg
$770M/s
$1.93B/s
$2.7B/s
Same formula as the calculator. Golden ×2.5, Rainbow ×3.5; pets can carry more than one mutation.
INCOME BY SIZE
Also in Cosmic
Centapede · Cosmic Gecko · Cosmic Gorilla · La Vacca Saturno Saturnita · Cosmic Dragon · Eternal Lunar Dragon · Unicorn
RELATED PETS
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Cosmic Skeleton Boss on the Steal An Egg Wiki
Community data from the Steal An Egg Wiki (CC BY-SA) · Updated Oct 24, 2026