Alchemists have the ability to transform anything, like water into gold and energy into matter, and can bring things back to life.

Alchemist's Tools

Essence Bearer
An alchemist would use a bottle such as this to capture and/or store a Life Essence. A well-made life essence can possess any living being but the essence is poisonous and will inevitably prove lethal to the being's host soul. If the alchemist chooses to include his own blood when making an essence, the essence will share the alchemist's powers.