The Compound system, accessible by pressing SHIFT + P, is a new enhancement system designed to help boost your character’s base stats by adding unused accessories and fusing them with Runes. Compound allows for a total of 6 different items to be registered. However, choose wisely; accessories that are used in the Compound system cannot be retrieved.
To start, if you hover your cursor over a Legendary-tier accessory, you'll find a new system: Power Potential. Each accessory has a different amount of Power Potential based on its tier:
The higher the Power Potential, the higher stats you'll receive after adding them to the Compound system.
Once accessories have been placed in the Compound system, all that's left is to acquire Etching Stones to engrave stat bonuses onto Runes.
Acquired from the Midnight Skypetal Plains, Etching Stones are used to activate Runes in the Compound window. Press the + button to open a list of available Etching Stones to add in. You will get different amounts of stats depending on the tier of the Etching Stone and different type of stats depending on which Rune it is, which is based on chance. Currently, the following Runes are considered the strongest for fighting creatures of the wild:
To the right is a list of the different types of Runes and the stats you can receive from each. Below is a list of different Etching Stone tiers:
Hongmoon Etching Stone: Engraves Refined or Superior stat boosts.
Burnished Hongmoon Etching Stone: Engraves Refined, Superior, or Heroic stat boosts.
Searing Hongmoon Etching Stone: Engraves Superior, Heroic, or Legendary
For a first-timer delving into the system, figuring out the functionality of Compound can be tricky.