Coen is human during the day and a vampire at night, and the two states play as substantially different loops.
Magical runes are scarred into his body and act as the conduit for his hex magic.
As a human he fights with directional sword combat, blocks, parries and stamina, and builds Activation Charges that fund active abilities.
As a vampire he gains claws, blood-drinking healing, supernatural movement including wall traversal and a Shadowstep-style reposition, and a wolf form for crossing country.
He carries a sword inscribed Peregrini Aurorae.
If his hunger is not managed he can lose control and kill people around him.
What is not
Listed rather than guessed. These promote out only against the retail build.
Whether Coen's own death has narrative consequences beyond a reload.
The full set of hexes and vampire powers available across a playthrough.