I just found a different forum topic this is explained under. I'm new here.
FC: 13AB08
FC: 13AB08
Think of souls like your character slot and sparks of life as what puts your soul into a new character for (up to) 52 irl weeks of gameplay.
The soul will carry over from character to character and maintain some skill ramps depending on previous lifes skills, but the sparks of life are just used to put the soul into a new character. When they are spent you will have to use another one to spark your soul in again.