Thunder Egg
| Hatch Chance | Wide pool; top results around 11-14%. |
|---|---|
| How to get | Viking Chicken drops / codes; produced by the weather-line chickens and Sergeant Hen. |
| Hatches | Static Chick (14%), Commando Rooster (12%), Astro Chick (11%), Thunderclap (5%), Aurora Hen (1%) |
The path to the Void branch
Thunder Egg is the mid-step between the starter chain and the Void branch. Viking Chicken drops it, and its main hatch target is Astro Chick, the unit that unlocks the Void family. Seed data puts the Astro Chick chance around 11%.
That makes Thunder the first mid-tier egg where your hatches really start shaping your long-term team rather than just filling out the commons.
What to expect from hatching
Thunder Eggs hatch a mix of mid-tier units, with Astro Chick as the chase result. At an 11% rate you still need a small batch, but it is far friendlier than the Secret-rarity hunts later in the game.
When you hatch an Astro Chick, put it to work immediately - it starts the Void egg chain that lets you grow the next family.
How to farm Thunder Eggs
- Keep Viking Chickens laying Thunder Eggs alongside Scratch Eggs.
- Redeem codes that include Thunder Eggs when available.
- Hatch in batches until you get Astro Chick.
- Let Astro Chick produce Void Eggs right away to start the next stage.
Why it matters later
The Void branch starts at Astro Chick, and everything after it depends on the Thunder Egg step existing in your chain. Keep at least one Viking Chicken laying Thunder Eggs even after you leave the early game.
It is cheap insurance when you need to rebuild the Void line after a Rebirth or a bad early run.
Batching Thunder Eggs efficiently
At an 11% target, the difference between a smooth unlock and a frustrating one is batch size. Collect Thunder Eggs from codes and production into a stockpile of ten or more before you start hatching, and run the hatch during a boost window if you have one active.
Spending eggs one at a time as they arrive feels productive, but it spreads the same attempts over days and makes the run feel far worse than it is.
Frequently asked questions
How do I get Thunder Eggs?
Viking Chicken drops them, and some codes include them. Keep a Viking laying regularly.
What is the Astro Chick rate?
Seed data shows around 11% - verify in-game before relying on the number.
Why is Thunder Egg important?
It is the only confirmed route to Astro Chick, and Astro Chick unlocks the whole Void branch.
How many Thunder Eggs should I stockpile first?
Around ten or more before hatching seriously - at an 11% target, batches beat one-at-a-time attempts by a lot.
Related guides
Data accuracy
Drop and hatch rates on Cluckcore come from community testing and can change between patches. Treat exact percentages as planning estimates and confirm them in-game before spending resources. If something does not match what you see, tell us via the contact page and we will update it.