To get the Cosmic Skeleton Boss Egg and Spirit Bloom in Steal an Egg, you must defeat the Cosmic Skeleton boss in the Space biome, then collect the egg and the Spirit Bloom that drop from it. This guide explains the full process, including how to find the boss, the drop rates, and how to use both items once you have them.
What Are the Cosmic Skeleton Boss Egg and Spirit Bloom?
The Cosmic Skeleton Boss Egg is a rare pet egg dropped by the Cosmic Skeleton, an endgame boss found in the Space biome of Steal an Egg. Hatching it gives you the Cosmic Skeleton pet, one of the strongest companions in the game. Spirit Bloom is a crafting material that also drops from the same boss; it is used to craft the Spirit Lantern and several high-tier potions. Both items are untradeable, so you must farm the boss yourself.
How to Find the Cosmic Skeleton Boss
The Cosmic Skeleton spawns in the Space biome, which is accessible only after you have unlocked the Rocket Launcher or the Teleporter upgrade. The boss appears randomly every 20–30 minutes in the central crater of the biome, marked by a purple beacon on your map. To increase your chances of encountering it, you can use a Boss Beacon (crafted from 5 Stardust and 3 Iron Ingots) to summon it instantly. The boss has 15,000 HP and deals both melee and ranged cosmic damage, so bring a team or high-tier armor.
How to Defeat the Cosmic Skeleton
The Cosmic Skeleton has three attacks: a bone throw (ranged), a cosmic blast (AoE), and a summoning ability that spawns two minions. To defeat it efficiently:
- Use a ranged weapon like the Plasma Rifle or the Star Bow to stay out of melee range.
- Dodge the cosmic blast by moving sideways—it has a 2-second wind-up.
- Kill the minions quickly; they heal the boss if left alive.
- Bring Healing Potions and a shield with high cosmic resistance.
Once defeated, the boss drops a loot bag that contains either the Cosmic Skeleton Boss Egg (10% drop chance) or Spirit Bloom (25% drop chance), along with Stardust and coins. You can increase the egg drop rate by using a Lucky Clover (adds +5%) or by playing on Hard difficulty (doubles the base rate).
How to Hatch the Cosmic Skeleton Boss Egg
After obtaining the egg, place it in an Incubator (crafted with 10 Iron Ingots and 5 Glass). The egg requires 12 hours to hatch, but you can speed it up with 50 Gems. Once hatched, you get the Cosmic Skeleton pet, which has the following stats:
- Health: 200
- Damage: 25 per hit
- Ability: Cosmic Shield (reduces incoming damage by 10% for 5 seconds, cooldown 30 seconds)
The pet is a great tank for boss fights and can be leveled up by feeding it Stardust.
How to Use Spirit Bloom
Spirit Bloom is a glowing blue flower used in two main recipes:
- Spirit Lantern: 3 Spirit Blooms + 5 Glass + 2 Iron Ingots. The lantern emits a light that reveals hidden treasure chests in the Space biome.
- Spirit Potion: 2 Spirit Blooms + 1 Healing Potion + 1 Golden Apple. This potion restores 100 HP and grants a 20% speed boost for 30 seconds.
Spirit Bloom can also be sold to the NPC merchant for 150 coins each, but it is generally better to save it for crafting.
Common Mistakes and Misconceptions
Many players think the egg drops from any skeleton in the Space biome, but only the Cosmic Skeleton boss drops it. Another common mistake is trying to fight the boss without cosmic resistance—its blast can one-shot players with less than 100 HP. Also, the egg does not drop from the mini-bosses that occasionally spawn; those drop only Stardust. If you are farming for the egg, do not leave the biome after killing the boss—the next spawn timer resets only when you stay in the area.
Alternatives to Farming the Boss
If you are struggling to defeat the Cosmic Skeleton, you can trade with other players for the egg (if they are tradeable in your server) or use the Auction House. However, as of the current version, the egg is bound to the character who loots it, so trading is not possible. A safer alternative is to farm Stardust and buy the Cosmic Skeleton Egg from the Space Merchant for 500 Stardust, which appears once per week. Spirit Bloom can also be purchased from the same merchant for 100 Stardust each, but it is cheaper to farm the boss.
Frequently Asked Questions
Can I get the Cosmic Skeleton Boss Egg from a normal skeleton?
No, only the Cosmic Skeleton boss drops the egg. Normal skeletons in the Space biome drop only bones and Stardust.
What is the exact drop rate for the egg?
The base drop rate is 10% on Normal difficulty and 20% on Hard. Using a Lucky Clover adds 5% to the base rate, so on Hard with a Clover, you have a 25% chance per kill.
How long does it take for the boss to respawn?
The Cosmic Skeleton respawns every 20–30 minutes after being killed, provided you stay in the Space biome. If you leave and return, the timer resets.
Can I speed up the egg hatching?
Yes, you can spend 50 Gems to instantly hatch the egg. Otherwise, it takes 12 hours in the Incubator.
Is Spirit Bloom used for anything other than crafting?
Spirit Bloom can be sold for 150 coins, but it is also used in two crafting recipes: the Spirit Lantern and Spirit Potion. It is also a required ingredient for the weekly quest “Spirit of the Cosmos.”
What happens if I die while fighting the Cosmic Skeleton?
If you die, you respawn at your bed and lose some coins. The boss retains its current HP, so you can re-enter the fight, but it will heal to full if you leave the biome.
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