Artifacts

**Artifacts** are equipped loot that alters the party's stats. Artifacts can be obtained from every boss encounter, the Dice of Greed in the the Hidden Haven, and chests in the Depths. Artifacts can be improved through Crafting.

## Basic Properties

* Up to 7 artifacts can be equipped at a time - two Weapons, two Armors, two Accessories, and one artifact of any of the three types in the Trio Slot.
* Artifacts are equipped to the Healer, but can influence any party member depending on their stats.
* Along with their combat stats, all artifacts have two descriptive stats - Quality and Item Level. These are hidden by default and can be toggled with "Show Additional Item Information" in the Options menu.
* Artifacts come in four Rarities - Uncommon, Rare, Epic, and Unique. Artifacts that aren't unique are referred to as Non-Uniques.
* Unique artifacts cannot roll sockets. Uncommon, Rare, and Epic artifacts can roll Gem sockets, but only uncommons can roll rune sockets.
	+ Special Runeword uniques can be crafted from Uncommon artifacts.

## Quality

* Quality is a modifier to most of the stats on an artifact. Higher quality artifact have higher stats than lower quality artifacts.
* Quality scales the stats of an artifact linearly per level. However, some stats such as +Rapid Shot arrows and +Talent levels, do not scale with quality.

* The minimum and maximum qualities on an artifact are 1 and 25.
	+ Artifacts from encounters, dice, and chests will roll a random quality between 1 and 10 when generated.
	+ Completing an encounter with one or more Chaos Crystals fed increases the max drop quality to 15.
		- In The Infinite Corridor, applying the Chaos infusion increases the base drop quality by 5 while also providing the typical Chaos quality cap of 15.
	+ 5 quality can be added through Torram's Upgrade craft.
	+ Mutation can add +5 quality as a positive outcome.
	+ Cursed Souls can be spent to add quality to an artifact, up to a base quality of 15.
	+ Stone of Madness increases the minimum quality of artifacts that drop in boss encounters.
* When viewing a Unique artifact in the atlas, the min-max on each stat number is taken from quality 0 and 10.
	+ Quality 0 cannot be obtained in typical gameplay.
* Artifacts with a base quality of at least 10 are labeled as "Perfect" and have a gold fog over their icons.

## Item Level

* Item Level, or iLvl, functions in different ways depending on whether an artifact is unique or not.

### Uniques

* Item level is related to the drop location. Items from areas deeper in the Vault typically have higher item levels.
* Artifacts with higher item levels tend to have more stats, but the stats on a unique are not calculated from their item level.
* Many unique artifacts can be upgraded using Divination Spheres found in the depths. The divining process increases the stats (and sometimes the item level) of the artifact.

### Non-Uniques

* Item level is approximately defined as the sum of the tiers of the affixes on the artifact. The exact Ilvl on a non-unique may vary depending on how it was crafted and whether it has any affixes with hidden tiers such as +talent levels or +Rapid shot arrows.
* The theoretical maximum item level on any non-unique artifact would be an epic with 8 tier XIII stat rolls. This artifact would be ilvl 104.
* Because ilvl is calculated from the stats and not the other way around, a great non-unique may have a relatively low ilvl.

An artifact where the apparent and reported iLvls are very different.An artifact where the apparent and reported iLvls are very similar.
## Drop Rate

Drop rate improves the chances that unique artifacts will drop from encounters. It does not modify how many artifacts drop.

### Improving Drop Rate

* Drop rate can roll as an affix on rare non-unique artifacts.
* Affluence is a unique that increases drop rate.
* Feeding Chaos Crystals to an encounter improves drop rate by 25% per level, up to a guaranteed single chaotic drop at 5 crystals.
* Each tier in The Infinite Corridor increases drop rate by 5%.
	+ However, applying the Chaotic infusion does not improve drop rate.

### Drop Rate Mechanics

The process of dropping artifacts from a non-dice source depends on the location:

* Outside of Depths:
	1. Roll how many non-unique artifacts drop that combat, minimum 1.
	2. Roll to drop each unique on the encounter's drop table. This is the listed probability in the atlas increased multiplicatively by the player's drop rate.
		+ If enough artifacts rolled in step one, all uniques from an encounter could potentially drop in a single fight.
	3. Reward the generated non-uniques and successfully rolled uniques.
* In depths (including chests):
	1. Roll for how many artifacts drop that combat, minimum 1.
	2. Roll for how many of those artifacts will be uniques. This probability is improved multiplicatively by the player's drop rate. This process depends on whether the encounter is in the depths or in a special depths key, such as Sacrificial Ground:
		+ In the depths, the game rolls the hidden unique probability against each artifact it decides drop in an encounter. If it rolls a unique, it then rolls to decide which unique drops using the unmodified atlas drop rates.
		+ In special depths keys, the game will always grant exactly one unique from that boss's drop table. It then decides which unique using the unmodified atlas drop rates.
	3. Reward the generated non-uniques and successfully rolled uniques.