Cultivators gained more life as they advanced. It was one of the basic principles everyone understood.
Beast bloodlines could naturally extend life but if added to the cultivation journey it could have massive results.
A human that only lived for 2000 years in the Sky Realm could live for 10,000 if a strong enough bloodline was awakened inside them.
Some believed in taking bloodlines as well but the beasts themselves always far surpassed any mixed bloodlines.
Lind was an extreme case as a True Lord but there was one race that surpassed all others.
Phoenix lifespans were comparable to dragons but had a major caveat.
They did not die.
Once their lifespan ended, they would burn their body to be reborn in the ashes and start over with their mind intact.
Unlike other races, they only became more profound and powerful as time passed but they could become stuck like anyone else.