Biometabolic -- Bioenergetic Conversion

Principle: Manipulates the vital field of organisms: extraction, transfer, or inversion of biological energy.

Strengths:

• Life drain, energy theft.
• Summoning of servants.
• Self-sustenance through vital absorption.

Weaknesses:

• Mental instability of the user.
• Progressive corruption.
• Countered by light arcanotechnology.