From The Red Pool [Origins]

The mod adds origins built around bloodthirsty demons and deal-making devils. A new character begins with debuffs such as low health, weakened attack power, hydrophobia and smite weakness, and the run pushes toward the Nether through hunger loss. Each origin evolves in stages, and every evolution opens new abilities gained from villagers and kills.

The first route follows demons who walk a path of bloodshed. It begins with double exhaustion, carnivore and slowed movement, and rewards each first kill with a slight attack and armor buff. Later evolutions add hunger gain on attacks, attack damage, armor, movement speed and a rage ability that consumes collected souls. The second route follows devils through a charisma-based, contract-centered design, where a player forms demonic contracts with other players to exchange souls for powers. Negotiations can fail, so devils start with zero armor and other debuffs and must rely on contracted souls.

The mod requires Origins and Pehkui, and Thermoo is optional. Origins supplies the origin system the pack builds on, and Pehkui handles the size scaling used by the character. It is required on the server and optional for players. It is published for Fabric and Forge as a data pack for 1.20 – 1.20.1, released under the MIT License and not open source.