The carved runes on Coen's body are the conduit for his magic. Everything in the hex tree runs through them.
OfficialCore mechanicCost unknown
Tree
Hex magic
Type
Core mechanic — always available
Phase
Day and night
Skill points
Unconfirmed
Training time
Unconfirmed
Prerequisites
None
Acquisition
Narrative — established in the story.
Effect
Official material states that Coen's magical runes are scarred into his body and act as the conduit for his magic, which is why hexes are available to him as a human rather than only in vampire form.