Celestial Concomitance

In the world there exists undead monsters that feasts on the live force of humans. For millions of years, humans who mastered the power of magic have been battling these monsters, but they have never won. This was until the birth of San Zhen sect, using a mysterious artefact, the head of the sect was able to find disciples from 3 different timelines, the past, the present and the future. This is the only chance that the undead can be fully eradicated.