Cracked Oozy Lava Eggひび割れたブヨブヨの溶岩タマゴ

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

How to use Cracked Oozy Lava Egg

Cracked Oozy Lava Egg is a pet egg that is about to hatch. Using it hatches Jr. Lava Slime.

Hold Cracked Oozy Lava Egg and use it (right-click).
Jr. Lava Slime hatches. Put it in the pet slot of your equipment to have it fight with you.

You get it by putting Oozy Lava 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 Oozy Lava 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 Oozy Lava Egg (materials)

Crafted at Egg Incubator What each crafting station makes →

Material	Amount	How to get the material
Oozy Lava Egg	× 1	Boss

Crafting time: 1,800 s