Cracked Pest Eggひび割れたペストのタマゴ

A mysterious, cybernetic egg that is about to hatch.
In-game description

How to use Cracked Pest Egg

Cracked Pest Egg is a pet egg that is about to hatch. Using it hatches Electro-Pet.

Hold Cracked Pest Egg and use it (right-click).
Electro-Pet hatches. Put it in the pet slot of your equipment to have it fight with you.

You get it by putting Pest Egg into an Egg Incubator with electricity connected. One egg takes 30 minutes (the crafting time in the game data is 1,800 seconds). If the power goes out, incubation pauses and continues when power returns; taking the egg out resets the progress.

Cracked Pest Egg key points (from the game data)

Sells to merchants for 7 Ancient Coins.

Calculated and summarized by this site from the game data (1.3.0.6).

How to craft Cracked Pest Egg (materials)

Crafted at Egg Incubator What each crafting station makes →

Material	Amount	How to get the material
Pest Egg	× 1	Breakable

Crafting time: 1,800 s