The dragon gods are all yandere for the Crimson Dragon. Thanks, I hate it.
I'm going to assume that all this hate against Zeno stemmed entirely from his recent actions:
1. Attempting to end his life ("Revoking the vow of the Dragon Warriors")
2. pointing a blade a Yona.
For all of his smarts, Zeno was so desperate to die that he completely glossed over the repercussions of his actions. It sounds like the dragon kami want him to wander some kind of tortuous purgatory forever. x.x
Fingers crossed that Yona successfully rescues everyone!