Hellforged

You have given a sacrifice to whatever evil god, to make you stronger. They have bestowed you a gift of either hardiness, deadliness, or Hellforged armor. Their blessing stays forever, as long as you give them a sacrifice once every year. All of these choices make you resistant, or if already resistant, immune to fire damage. 

Hardiness. You have chosen the gift of hardiness, and now you have become stronger. Your max CON is now 24 and you instantly gain +4 to it. At the beginning of your turn, gain one temporary hit point.

Deadliness. You have chosen the gift of Deadliness, and now you have become stronger. Choose two of either INT, WIS, STR, or DEX. Which ever you choose gains +2 to a max of 24, and the other two gain +1 to a max of 21. All damage you deal gets a extra +2.

Hellforged. You have chosen to become a hellforged entirely. Choosing this changes your appearance and race, but none of your abilities or stats. You become a red or black demon, with a tail. All your stats go up by two to a max of 22. You gain hellforged armor, and it acts like half plate, but there are no prerequisites or downsides. 2 of your dexterity affects this armor. Then, you gain a Hellforged sword. It is considered magical and has a +2 to hit and +2 damage. It does 1d10 damage and is one-handed. Then you gain a Hellforged shield. It is a regular shield just it looks cool. You gain Immunity to fire damage and cannot feel heat. Most people will recognize you as a demon and will attack you, run away, or alert some guards or something.