Steal An Egg: How to Use the Mutation Consumable on Unhatched Eggs

The Mutation Consumable is the only reliable way to force the Fractured mutation onto an egg in Steal An Egg. It is a purple crystal item sold in the Boss Shop, it is spent the moment you use it, and it only works on an egg that is sitting in your base waiting to hatch. Get the order wrong and the item is gone with nothing to show for it.

Quick answer: Buy the 10% Mutation Consumable for 400 Boss Tokens in the Boss Shop, place an unhatched egg in your base, equip the consumable, stand next to the egg, and hold E (or tap the interact button on mobile) at the “Apply Mutation” prompt. Each use has a 10% chance to apply Fractured.

Mutation Consumable cost, source, and success rate

Everything that matters about the item fits in one place. Note that the shop label itself reads “10% Mutation Consumable,” and the 10% refers to the chance the mutation actually sticks.

Detail	Value
Shop name	10% Mutation Consumable
Price	400 Boss Tokens
Where to buy	Boss Shop
Token source	Defeating the Abyss Overlord in a Rift
Valid target	A placed egg that has not hatched yet
Success chance	10% per use
On failure	The item is consumed, the egg is unchanged
Mutation applied	Fractured

Boss Tokens only come from the Rift boss. Enter the portal when a Rift spawns, clear the Abyss Overlord, and you should walk away with enough tokens for roughly three consumables per successful clear.

Running through a Steal An Egg zone with the Shop button and Index panel on screen — The Shop and Index buttons stay pinned to the screen while you move between zones.

How to apply the Mutation Consumable to an egg

Open the Boss Shop and buy the Mutation Consumable for 400 Boss Tokens. It shows up in the shop grid as a glowing purple crystal. Buy more than one if you can afford it, since a single attempt almost never lands.

Bring an egg back to your base and place it on the floor inside your plot. The egg has to be down and incubating before anything else works, so check that a hatch timer is ticking on it.

A placed egg in Steal An Egg showing a 3m14s hatch countdown — A placed egg counting down to hatch. The consumable only works while this timer is still running.

Open your inventory and equip the Mutation Consumable to your hotbar so your character is holding the purple crystal. You cannot apply it from the inventory screen alone.

Walk right up to the egg until the prompt appears, then hold E on PC or tap the interaction button on mobile. The prompt reads “Apply Mutation” and shows the 10% success chance next to it.

Watch the notification. Nothing else needs to be confirmed, and the roll resolves instantly.

How to tell whether the mutation worked

A failed attempt throws up a notification reading “The consumable fizzled…” and the crystal disappears from your inventory. The egg keeps its normal appearance and its hatch timer carries on untouched.

A success applies Fractured to that egg, so the pet inside hatches with the mutation attached. Fractured is one of the stronger income multipliers in the game, landing at roughly 2.75x on top of whatever the pet’s size already earns. It cannot be rolled from a normal hatch at all, which is the whole reason the consumable exists.

The Lake zone, one of the biome areas you rotate through while farming eggs to mutate.

Why the Apply Mutation prompt does not trigger

There are only a few reasons the interaction refuses to fire, and none of them are bugs.

You are standing too far away. The game pushes a “Get closer to the egg” message until you are inside the interaction range.
The consumable is not equipped. It has to be the item in your hands, not just sitting in the inventory.
The egg is still being carried or has not been set down inside your base.
The egg already hatched. Once a pet is out, the window has closed for that egg.

Glowing orange arrows marking the route through a Steal An Egg course — Orange directional arrows mark the route back toward your plot after grabbing an egg.

What 10% actually costs you in Boss Tokens

A 10% chance means nine out of ten crystals are going to fizzle, and each one still costs 400 Boss Tokens. Stacking attempts is the only way to close the gap. Around 88 uses gets you to a 99.99% chance of at least one Fractured, which is a useful reminder that this is a long grind rather than a one-and-done purchase.

You can keep throwing consumables at the same egg. If one fizzles, equip another and hold E again, as long as the egg has not finished hatching. That pushes a decision on you, since a long hatch timer gives you more attempts than a quick one.

Tip: Save the crystals for eggs you would be happy to keep even without a mutation. A Fractured roll on a weak pet multiplies a small number, while the same roll on a rare or high-tier egg is where the 400-token price starts paying for itself.

Sprinting through the Desert zone in Steal An Egg hunting for eggs — The Desert zone, where higher-tier eggs worth mutating start appearing.

One last naming note, because it trips people up. Searches for a “Mutation Shard” almost always point back to this same purple crystal. There is no separate shard item, and the consumable is also unrelated to Sakura Crystals, which feed the Sakura Incubator and its Bloom and Spirit Bloom mutations. If you are chasing Fractured, the Boss Shop is the only counter that sells what you need.