you must choose a category that your abilities derive from.

the old blood has made you strong, when you drop to 0 hit points you can instead choose to regain 1d6 hit points this can be done 3 times you must then wait until next dawn to regain your charges.

depending on your gender a kuva lich will have different stat bonuses. female liches are more intelligent and calculated, male liches are more brutish and headstrong.