As you play through Dark Side your character will advance by increasing your Character Proficiency Bonus or CPB. Your gamemaster will determine when the party or individuals gain CPB. If you are running a premade adventure there may be preset advancing points within the adventure. Character CPB maxes out at five.
Health Increase: Your character will increase their health on each CPB by their class health + constitution.
Skill Increase: Your character gains 2 skills each CPB increase.
Attribute Increase: You receive an attribute point at each CPB increase. Your base attribute max is +5.
Mastery: Your character starts with one mastery and gain an additional one per CPB increase.