Each time you deal in souls, keep track of it, each soul requires a contract or obligation to be filled, in which they can be tied to the dealer, on the other hand, if you had no souls, and make a deal, you cannot collect souls, unless you are allowed to by the dealer, Each soul increases one of your Ability Scores by 1 while in your True form, Also, Once you Reach 10000 Souls, you are considered a Primary Overlord.

Your Features Deepen, leaning further into one aspect of yourself, as you grow to a large creature, while in this form, you add the souls you have, to your characters stats.

You gain proficiency in Intimidation.

Your Intelligence score increases by 1, and your Charisma score increases by 2.

Sinners are Immortal, Unless they die by Angelic Weapons.

Size. Sinners are around 3'5 to 8ft tall, varies from sinner to sinner, Though you do count as a Medium Creature.

Your base walking speed is 35 feet.

Thanks to your infernal heritage, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

You have resistance to fire damage.

You can speak, read, and write Common and Infernal.