Qophelo's Regeneration:

If successful, the target of the spell increases their chance to heal per session to 100%. For Immortal characters, they may now heal passively. Additionally, Regeneration counts towards and for the scaling cost of Heal. Additionally, the upkeep is equal to a quarter of the cost, before cost reductions, rounded down. This upkeep does not increase unless it is recast. If a non-immortal character under the effects of this spell were to die of old age, there is a 25% chance that they remain alive.