There are two main stats called Body and Mind, which are further divided into three sub-stats. Body is upgraded via Prestige, which you gain from earning glory, doing notable feats or just being a well-known figure in society such as a noble. Mind is upgraded by Piety which is gained being virtuous according to your religious beliefs.
Strength is about how physically strong you are and how much physical damage you can dish out.
Constitution is about how tough you are and taking physical damage.
Agility is about speed and reflexes. With the right build, you use in the place of both Strength and Constitution, but someone relying on Agility tends to be fragile and something of a glass cannon.
Will is about how determined you are and the stat used for resisting magic used on you.
Intellect is about how smart you are and the stat used for understanding and learning magic.
Presence is about how charismatic you are and the stat used for casting spells and actually using your magic.
All Mind Stats increase your magic reserves aka how much magic you can use before running dry.
At certain break points for each stat, you gain a Trait, which is related to either your physical aspects or your metaphysical aspects. Aka your Body and Mind. Body Traits are upgradable with large amounts of Prestige. Mind Traits are upgradable with large amounts of Piety. Traits are what makes you stand out and give you a unique touch. They are also primarily used as a foundation for learning spells such as getting fire-based magic or rainbow-based magic or bear-based magic.
Bloodlines and Epithets are basically super-traits and you can only get one of each. Your bloodline is determined at birth unless you do something very special. Epithets are earnt by doing stuff to earn a notable nickname and while you can only have one, you can change it and get a new Epithet. The PC's father has a bloodline from being descended from Thor and his Epithet gives him bonuses to fighting anyone of royal or lower social status, bonuses against women and a bonus to breaking his prisoners.