The Catalyst Hen is a Secret rarity fighter in Grow a Chicken Fighter that only comes out of the Colossus Egg. It hatches at a rate below 1%, which makes it one of the rarest pulls in the game and a strong pick for both the Arena and the Tower.
Quick answer: Hatch Colossus Eggs. The Catalyst Hen is the Secret drop from that egg with a below 1% chance, so you need a steady supply of Colossus Eggs before one appears.
Colossus Egg hatch rates
The Colossus Egg is the only source of the Catalyst Hen. Six chickens can hatch from it, and the Catalyst Hen sits at the very bottom of the odds. Here is the full drop table.
| Chicken | Rarity | Hatch chance |
|---|---|---|
| Catalyst Hen | Secret | Below 1% |
| Storm Colossus | Secret | 1% |
| Talon Titan | Mythical | 10% |
| Iron Cluck | Legendary | 15% |
| Shockwave Hen | Epic | 28% |
| Rumble Rooster | Rare | 46% |
How to reach the Colossus Egg
You cannot buy Colossus Eggs directly. They come from the Founder Rooster, and getting to a Founder Rooster is a chain that starts with the common Nest Egg. Follow this order and each rooster or chick you unlock speeds up the next stage.
You know it worked when a Catalyst Hen shows up in your Flock. Because the odds are so low, expect to burn through a large stack of Colossus Eggs before it lands, so keep the Founder Rooster generating eggs the whole time.
| Stage | Source | Chance |
|---|---|---|
| Viking Rooster | Nest Eggs | 2% |
| Thunder Eggs (via Viking Rooster) | Viking Rooster | 70% |
| Static Chick | Thunder Eggs | 14% |
| Thunder Eggs (deployed Static Chick) | Static Chick | 100% |
| Founder Rooster | Thunder Eggs | 3% |
| Catalyst Hen | Colossus Eggs (via Founder Rooster) | Below 1% |
Catalyst Hen base stats
The Catalyst Hen comes in a normal form and an Inverted form. The Inverted version carries higher numbers across the board, which is why players chase it. These are the base stats before any levelling or fusion bonuses.
| Stat | Normal | Inverted |
|---|---|---|
| HP | 362 | 416 |
| Attack | 35 | 40 |
| Speed | 15% | 21% |
| Power | 15% | 21% |
How the Inverted mutation works
The Inverted mutation raises HP and Attack by 15% and Speed and Power by 5% over the normal form. Every egg in the game has a flat 0.5% chance to hatch a chicken with this mutation, so pulling an Inverted Catalyst Hen straight from a Colossus Egg is extremely rare.
There is a second route through fusion. If you fuse your main chicken with one that already has the Inverted mutation, the main chicken can pick it up. When both chickens are the same tier, the success rate is 50%. A one-tier, two-tier, or three-plus-tier gap between them lowers that chance, so match tiers when you can.
Where the Catalyst Hen ranks
In its base form the Catalyst Hen outperforms both the Kraken Chicken and the Storm Colossus, and it sits just under the Eclipse Hen. That places it firmly in the top four fighters alongside those three, and it is a solid anchor for an Arena team.
Compared with the Eclipse Hen, the Catalyst Hen is generally easier to obtain. The Eclipse Hen requires Ascension Eggs, which you earn at Rebirth milestones starting at 10 Rebirths, then 100, 250, and 500 Rebirths, with a smaller chance to appear during Admin Abuse events. The Catalyst Hen only asks for a long run of Colossus Egg hatches, so once your Founder Rooster is set up, it is mostly a matter of keeping the eggs coming until the sub-1% pull finally lands.
