Abilities
Three trees, split by when they work. That split, rather than what the trees contain, is what shapes every build.
Swordmastery
Day & night
The only tree that works in both forms, which is why it underpins almost every build. Techniques are gated behind manuals rather than pure level, so the tree advances at the speed you find books.
Witchcraft
Day
Hexes, cut into Coen's skin as runes and paid for in health rather than a mana bar. Daylight only, so it is the answer to every problem you decided to solve as a man.
Vampirism
Night
Movement, senses and violence, unlocked as Corruption rises. It is the strongest tree and the one that costs you something to use.