A Crystal of Enhancement is a consumable that grants a +N passive skill bonus to a piece of equipment when targeted at it. Each crystal carries one of thirty-five skill attributes and one of five intensity values (+1 through +5).

When a crystal is generated as loot, the following properties are rolled:

• Appearance: hue 2747, item graphic 0x1F1C.
• Name: “A Crystal of Enhancement”. The specific skill is shown on the item's property list, not in the name.
• Attribute: a random pick from the 35 supported skill attributes.
• Intensity: a random integer from +1 to +5.
• Break behaviour: whether the crystal can break, and its break chance, are derived from the intensity (see table below).

The break chance is rolled at crystal creation from the following ranges:

When the crystal is applied, a roll from 0–99 is compared against the crystal's break chance. If the roll is at or below the chance, both the targeted item and the crystal are destroyed.

Older crystals that were previously created with a non-zero break chance have their break range refreshed using the table above the next time they load.

The 35 supported skill attributes are:

Double-click a crystal in your backpack and target a piece of equipment to apply it.

Before any bonus is applied, the following must be true:

• The crystal must still be in your backpack. Otherwise: “The crystal of enhancement must remain in your backpack to use it.”
• The target must be an enhanceable item. Otherwise: “This item cannot be enhanced.”
• The item must not have its enhancement ability disabled.
• The item must not have reached its enhancement maximum. Otherwise: “This item has already met it's enhancement maximum.”

Crystals can be applied to:

• Armor
• Shields
• Jewelry
• Talismans
• Clothing
• Weapons

Targeting anything else produces a per-skill rejection message (for example “You cannot apply magery to that item.”).

Each eligible item has five skill-bonus slots. The crystal fills the first empty slot with its skill and amount. If all five slots are already filled, you see “There are no skill slots available on this item.” and the crystal is not consumed.

The item being enhanced must be in your backpack. Otherwise: “The equipment must be in your backpack to enhance it.” The crystal is not consumed.

On a successful application:

1. The break roll is checked first. If it succeeds, you see “The crystal shatters, destroying your equipment.” and both the equipment and the crystal are destroyed.
2. Otherwise the next free skill slot is filled, you see “You apply the enhancement.”, the item's enhancements-made count goes up by 1, and the crystal is consumed.

Each enhanceable item tracks how many crystals can be applied to it:

• The hard maximum is 5 enhancements per item.
• Newly enhanceable items start with a limit of 3 enhancements.

You can raise an item's limit by one (up to the cap of 5) with a Max Enhancements Deed:

• Item graphic 0x14F0, hue 1937, weight 1.0, labelled “Max Enhancements Deed”.
• Double-click the deed from your backpack, then target the item.
• The deed refuses items that cannot be enhanced.
• It refuses items whose five skill slots are already all filled.
• It refuses items already at the cap of 5.
• On success the item's limit goes up by 1 and the deed is consumed.

A glimmering chest of belongings can drop when a creature dies. The drop chance is:

''(HitsMax + StamMax + ManaMax) / 12000 × 20%''

capped at 100%.

The chest's level is rolled randomly. Boundaries (with BetterLoot applying a 0.2 reduction to the roll where active):

Crystals only drop from Levels 3 through 5:

A demigod kill drops one crystal unconditionally, an additional crystal if the kill is boosted, and a further crystal because the kill is a demigod (for a typical total of 3 on a boosted demigod kill).

A champion kill awards one random crystal to the player at a 30% rate, placed directly in the backpack.

The Enchantment Vendor Stone sells guaranteed +5, non-breakable crystals. The vendor's purchase header reads “+5 Skill - No Break Chance”.

• Crystal of Enhancement (+5, no break): 100 Sosarian Dollars each.
• +1 Enchantment Slot Deed (Max Enhancements Deed): 100 Sosarian Dollars.
• Purchased items go to your bank box if available, otherwise into your backpack.

The Tome of Enhancement is a storage key for Crystals of Enhancement.

• Item graphic 0x1C13, hue 195.
• Cannot be used from your pack. Lock it down in a house and use it from there.
• Listed as a donation reward at 100 donation points.

A crystal's property list shows two lines:

• “Chance To Break Item: N%” — or “Will Not Break Item” when the crystal cannot break or has a 0% break chance.
• “Armor, Shield, Jewelry, Talisman: +N Skill Name” — note that the displayed text omits Clothing and Weapon, although both are valid targets.