Titan Fragments

Mythic Heroes and Legendary Villains
Titan Fragments occur randomly in any sapient population but not through genetics, nor can they be created artificially. After Felumbra gifts a piece of herself to create a soul that represents the uniqueness of each individual, fragments might be imprinted on a soul as it becomes embodied in a being. A birthmark on the soul, left by aether. The Gods may be all powerful in their own respect, but forces unknown give their creations abnormal strength and skill outside the powers they could bestow. Some Ancient-Ones speculate that the fragments are whats left of the Titan's consciousness that created Alarra, hence the name. Others prefer to believe that the World around them is creating its own balance, giving complex life a chance to choose.

A fragment gives them many supernatural abilities, lets them learn and heal at an accelerated pace, and even the most magically mundane can learn how to cast spells with relative ease. They are more powerful than their ordinary humanoid counterparts, but look no different.

Many have tried and failed to replicate a spark artificially, and many more have unsuccessfully prayed or even wished for one, to no avail. The only way to acquire one is for the Universe to grant it.

In Game Mechanics
A Titan Fragment allows player characters and certain NPCs to follow the default rules for resting, completing a short rest in one hour and a long rest in eight hours. All other characters, primarily NPCs or players that have died too many times, follow the "gritty long rest rules" completing a short rest in eight hours, a long rest in 7 days, and requiring healer's kits to spend hit dice.

A Fragment is not easily contained, and dying weakens the bond to its vessel. The 2nd time a character dies, keeping their fragment requires sacrificing a magic item they are attuned to. The 4th and further times a character dies, they permanently lose an attunement slot. If they are unable to provide an attuned item upon resurrection, their fragment is lost and cannot be restored. True Resurrection bypasses the need for an attuned item.