Crystals

Crystals enhance weapon and armor abilities by providing additional passive skills to the party member using equipment with crystals in it. They can be very powerful and easily turn the outcome of a battle when set up right beforehand.
Types
Crystals come in 4 types:
Status - Grant passive skills that give bonuses on attributes or bonuses for wearing the equipment.
Offensive - Grant passive skills that enhance physical and magical attacks by adding properties, increasing their power or inflicting status effects.
Defensive - Grant passive skills that enhance defense by adding properties, increasing attributes, resistances or status effects.
Utility - Grant passive skills that greatly vary in effect.
Variations
Crystals come in 2 variations: Natural and artificial. Artificial crystals are marked with an asterisk (*) in front of the crystal's name. When fusing crystals, the resulting crystal will always be artificial. Artificial crystals cannot be used as fuse crystals, only base crystals.
Purity
Each crystal comes with a random purity level (P) to it. The higher the purity, the better crystals you can fuse with them.
Rank
The crystal's rank is shown through roman numerals next to its name. It ranges from I to X, with X being the maximum rank a crystal can have, regardless of purity or size.
A crystal's passive skill becomes stronger with higher rank, in total 3 levels per skill. The required ranks for each level are: III: Skill level 1 V: Skill level 2 X: Skill level 3
Size
Each crystal comes in a random size between 1 and 3, indicated by small circles representing the amount of slots a crystal needs in an equipment piece. The smaller the size and the higher the purity the better the crystal is for slotting and fusing.
Fusing Crystals

You can combine / fuse crystals with the same passive skill on them.
When combining a crystal you choose a base crystal and a fuse crystal with purity (P) above 0 for either and confirm the fusion.
Only pure crystals can be used as fuse crystals. Artificial crystals (marked with an asterisk (*) in front of the name) can only be used as base crystals.
After fusing two crystals, the resulting crystal:
Will have the purity of the base crystal minus 1 (e.g. P3 -> P2) regardless of the fuse crystal's purity.
Will have the sum of both crystal's rank (e.g. III + IV = VII)
Will be the average size of both crystal's size (e.g. * + *** = **)
Becomes an artificial crystal
Adding / Removing from Weapons / Armor

In order to add a crystal into a weapon or armor:
The crystal needs to be rank III or higher
The equipment needs to have the amount of crystal slots available / free for the crystal's size to fit
You can set multiple crystals into the same piece of equipment as long as the above requirements are met.⠀
When removing a crystal from a piece of equipment, the crystal:
Will get a purity of 0 (P0)
Will get a size of 3 (***)

When removing a pure crystal from weapon or armor, it can not be used as a base crystal for fusing anymore, but as a fuse crystal.
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