Object in Xenoblade Chronicles 2. An blue colored gem that can resonate with a Driver to become a Blade. The crystal is then embedded in the chest or head of the Blade.

Flesh eater core crystals are either Pink and Blue Gems or fully Red gems.

Artificial core crystals are Yellow, circular and instead of gems, they're made of Metal.

Aegis core crystals are t-shaped, and one of the main symbols of the Xenoblade franchise.

Core Crystal as an Object before resonating with a driver

Example of various Core Crystals

Artificial yellow Core Crystal in Poppi's chest

Red Crystal in Jin's forehead

Aegis core crystal in Pneuma's chest

Mio's Flesh eater core crystal on her chest

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