Vault Catalyst

**Vault catalysts** are items that can be applied to crystals to set the modifiers for that vault.

## Obtaining

### Crafting

To make a new catalyst, combine 9 catalyst fragments:

You can also reroll catalysts by combining them with a perfect alexandrite:

### Vaults

Vault catalysts can also be found inside of Pixel Art rooms, as well as in "Prismatic" rooms in a Build a Vault. Additionally, they can be found in reward crates.

### Soul Shard Trading

Vault catalysts can also be obtained through Soul Shard Trading, costing 400-1100 soul shards unless obtained through a random purchase.

### Trader Cores

Finally, vault catalysts can be sold by traders at higher vault levels.

## Usage

### Applying to a Crystal

Any random modifiers listed on a vault crystal will be different on each individual vault crystal. You can see what modifiers a catalyst will add by putting it with a vault crystal into an anvil. Alternatively, you can use a catalyst decryption table which shows you what 10 separate catalysts will add to a crystal.

A catalyst cannot be applied to a vault crystal if:

* The crystal has had a Seal of the Challenger or a soul flame applied to it.
* The crystal is Exhausted.
* The catalyst would add a particular modifier, but the crystal already has that modifier.
* The catalyst would add a random modifier from a particular category, but the crystal already has all the possible modifiers for that category (eg. it would add a random curse but the crystal already has Fatiguing, Freezing, Hunger, Poisonous, Slowed, Tired, Weakened and Withering).

Catalyzing a crystal will "re-seed" any of the applied modifier types (positive, negative, or curse), meaning that different results will be shown when the crystal is then checked against another catalyst. For example, a particular catalyst might add Safe Zone, Furious and Slowed to a particular crystal. Applying a catalyst which adds only Trivial to that crystal and then checking it against the first catalyst again might cause the catalyst to add Easy, Furious and Slowed; only the positive modifier was rerolled.

### Crafting ingredient

#### Vault Inhibitors

By combining a perfect echo gem with a vault catalyst, you can make a vault inhibitor.

## Catalyst Information

### Possible Catalyst Rolls

See modifiers, as well as the Vault Hunters website (scroll down to Modifiers - any modifier with a catalyst next to it is a possible catalyst roll).

### Re-seeding crystals

Main article: Painite Star
A vault crystal can be combined in an anvil with a painite star to re-seed a vault crystal. This means that it will checking the crystal against a given catalyst will (usually) produce different results compared to before the star was applied.

### Catalyst Pattern

When creating new catalysts, it will be one of these options:

* Random Positive
* Static Positive
* Random Positive, Random Negative
* Random Positive, Static Negative
* Static Positive, Random Negative
* Static Positive, Static Negative
* Random Negative
* Static Negative
* Random Positive, Random Negative, Static Curse
* Random Positive, Random Negative, Random Curse
* Static Positive, Random Curse
* Static Positive, Random Curse, Random Curse
* Static Positive, Random Negative, Random Negative
* Static Positive, Random Positive, Random Negative