Eggfinity Stones

**Eggfinity Stones** (often called **Stones** for short) are items in Egg, Inc. introduced in Version 1.20 alongside Artifacts. They are one possible reward from launching Spaceships. Fragments of these Stones can be obtained by consuming certain Artifacts, e.g. consuming Lunar Totems gives Lunar Stone Fragments to the player.

Certain Artifacts have sockets, and players can put Stones inside these sockets to enhance the effects of Artifacts. The first tier of each Stone is a Fragment. Stone Fragments cannot be placed inside sockets as they do not provide any bonuses. Stone Fragments must be used in the Hall of Artifacts in order to craft higher tier Stones.

The cost of setting a stone follows this formula:

⌊

Host Artifact crafting cost
20

Stone crafting cost
10

⌋

{\displaystyle \left \lfloor \frac{\text{Host Artifact crafting cost}}{20} + \frac{\text{Stone crafting cost}}{10} \right \rfloor}

Both crafting prices are base, unaffected by events. The host Artifact's tier also affects its 'crafting cost', visible under the table at the bottom of the Artifact explorer tool on the right side.

One example is the T3E Demeter's Necklace, which has a base crafting price of 39367.55. Because a T2 Soul Stone's base crafting price is 5196.19, the cost of setting it inside the Demeter's Necklace becomes 2487. Another example is the T4L Phoenix Feather: with a base price of 1720176.75, and with the base price of a T4 Prophecy Stone at 731674.39, the cost to slot it into that artifact is 159176.2765.

## Stone Crafting

Tier 2 and higher stones can be consumed for Golden Eggs, and you can generally craft a stone of a higher tier with enough stones of the lower tier, plus some Golden Eggs. If you craft enough to get their Golden Egg costs down, the following three stones will run you a Golden Egg profit when you craft the T1s into T2, then consume the T2: Lunar, Shell, Tachyon. No other stone (or artifact) exhibits this behaviour, even after 300 crafts (which reduces the crafting cost to the lowest it will ever be).

## Types of Stones

### Clarity Stone

Clarity Stones enable the effect of the host Artifact to work on the Enlightenment Egg. Because you can use Eggceptional Clarity Stones to get an artifact up to +300% (x4) effectiveness, even after you get the Enlightenment Diamond, these are very useful on Medallions and Brooches to farm Golden Eggs on an Enlightenment Farm.

### Dilithium Stone

Dilithium Stones increase boost duration. When a boost is consumed, all Dilithium Stones impact its duration, and then the stones are never checked again; this means you should make yourself a "Dilithium Set" of artifacts with as many slots as possible devoted to Dilithium Stones, without caring about what the artifacts actually do. This will let you equip the Dilithium Set, use boosts, and then swap to a set of *relevant* artifacts, keeping the duration buff from the Dilithium Stones.

### Life Stone

Life Stones improve the Internal Hatchery rate. Aside from being the best stone to add to your Chalice, if you have enough stones and artifacts, a Monocle loaded with these is an ideal second artifact when using tachyon prisms.

### Lunar Stone

Lunar Stones increase away earnings. This has no known use-case; the only context in which you might care about away earnings is on Enlightenment, where you can't use boosts anyway, but in that context you'd be better off with Clarity Stones. In general, the best use of Lunar Stones is as Golden Egg income, especially once you have crafted enough T2 stones to run an egg profit off of the T1s.

### Prophecy Stone

Prophecy Stones increase the Egg of Prophecy bonus.

### Quantum Stone

Quantum Stones increase shipping capacity.

### Tachyon Stone

Tachyon Stones increase egg laying rate. They belong on your Metronome and Deflector, and may be useful on your Compass and Gusset.

### Terra Stone

Terra Stones increase max running chicken bonus.

## Effect Stacking

The following stones stack **multiplicatively** with themselves (and other Artifact effects). For example, one Eggsquisite Shell Stone gives +8% egg value, and using two would give +16.64% egg value.

1.08
×
# 1.08
1.1664

{\displaystyle 1.08\times 1.08=1.1664}

* Dilithium Stone
* Life Stone
* Lunar Stone
* Quantum Stone
* Shell Stone
* Tachyon Stone

The following stones stack **additively**. For example, one Eggsquisite Soul Stone gives +10 percentage points to your Soul Egg bonus, and using two would give +20.

* Clarity Stone
* Soul Stone
* Terra Stone

The effect of multiple Prophecy Stones is more nuanced. The bonuses from Prophecy Stones are added together (along with any bonus from the Book of Basan and the Prophecy Bonus epic research). This bonus then contributes to the compounding effect of Eggs of Prophecy, meaning each additional Prophecy Stone has a greater effect on the total Earning Bonus than the previous one.

### Comparing Earning Stones

So that you can easily tell which stones you should slot to earn the most bocks, here are how the various stones compare when stacked:

* Shell Stone: Percentage as listed.
* Tachyon Stone: Percentage as listed.
* Soul Stone: Does not work with Soul Mirror. Assuming you've maxed out Soul Food, all of your soul stones added together divided by 150 is your net percent, meaning you get diminishing returns (and T2 and T3 stones are fundamentally worthless - just use shell stones); as an example, here is the converted equivalent of the given number of T4 soul stones to a percentage, stopping when a T4 shell stone would be better. Remember, outside of the Enlightenment Egg, it doesn't matter which artifact holds which stone. Each percentage is the effect of that stone - for example, number 2 shows you the benefit of adding a second stone on top of one already equipped.
	1. +16.67%
	2. +14.29%
	3. +12.5%
	4. +11.11%
	5. +10%,**DO NOT USE**
* Terra Stone: Has diminishing returns which diminish *faster* if you have a Vial of Martian Dust equipped, because the higher your RCB, the less the benefit of adding the same number to it. Likewise, if you haven't completed all of your relevant Common Research and Epic Research yet, this stone is better, because your starting number is lower. Assuming a base number of 540 (all research maxed out) and *no* vial, your first T2 terra stone is worth about +1.85% and your first T3 terra stone is worth about 9.26%. T4 terra stones can outperform shell stones, so here is the converted equivalent of the given number of T4 terra stones *without a vial equipped* (by the time you care about this question you should have a T4C Prime Vial of Martian Dust at a minimum, and equipping that makes even your first T4 terra stone a mistake) to a percentage, stopping when a T4 shell stone would be better. Remember, outside of the Enlightenment Egg, it doesn't matter which artifact holds which stone. Each percentage is the effect of that stone - for example, number 2 shows you the benefit of adding a second stone on top of one already equipped.
	1. +18.52%
	2. +15.62%
	3. +13.51%
	4. +11.9%
	5. +10.64%
	6. +9.62%,**DO NOT USE**
* Soul + Terra: Using the same assumptions as above, including no vial equipped, here is the optimal equipping order of T4 Soul and Terra stones:
	1. Terra (18.52)
	2. Soul (16.67)
	3. Terra (15.62)
	4. Soul (14.29)
	5. Terra (13.51)
	6. Soul (12.5)
	7. Soul (11.11)
	8. Terra (11.9)
	9. Terra (10.64)
	10. T4 Shell Stones are better.

## Trivia

* It costs Golden Eggs to add a Stone to an Artifact, but it is free to remove the Stone from the Artifact. However, you will have to pay the cost of adding the Stone to the Artifact again if you want to put it back on the Artifact.
* The effect of Clarity Stones add to each other, so 2 Clarity Stones allow the host artifact to have a 50% effect on the Enlightenment Egg. Even if there is more than one Eggceptional Clarity Stone, the effects will still add to each other; for example, a Legendary Tier 4 Gusset with 3 Eggceptional Clarity stones will have +300% effectiveness, or +75% hab space.
* **Warning:** The game will let you equip Eggfinity Stones onto an Artifact without a confirmation dialogue; this can result in wasting tens of thousands of Golden Eggs due to simply pressing on the wrong part of the screen.
* "Eggfinity Stones" are a parody of "Infinity Stones" - powerful gems with different abilities from the Marvel Universe.