Divinity, to some extent, is a unique trait of gods. It concerns a deity's character, beliefs, command of laws, power attributes, and factional preferences.
Mortals can gain increased lifespan by absorbing divinity. However, this is dangerous because divinity contains the characteristics and beliefs of the gods. A fallen deity can likely seize the body of a mortal that has absorbed its divinity, thereby resurrecting itself.
More often, the collector would erase any trace of the original deity in the divinity before absorbing it, thereby gaining a comprehension of its laws, which could put one on the path to igniting their Divine Fire.
Powerful deities can divide their divinity and grant it to mortals who qualify to ascend to godhood, allowing them to comprehend the laws within it and more easily transcend the boundary between God and mortal.