I released Vital XP, a small Minecraft mod that overhauls survival progression by linking a player’s maximum health to their XP level.
Instead of having a fixed amount of hearts, players gain health as they level up and lose it when XP decreases, making experience a core survival mechanic rather than just an enchanting resource.
Once the maximum health cap is reached, extra health is converted into permanently locked hearts, which can only be lost on death.
Modrinth page link: https://modrinth.com/mod/vital-xp/