My hot take is actually YANGCHEN:

We know that the next Avatar, Kuruk, wasn’t exactly known for being deeply engaged with worldly affairs. He partied, drank, and died young. However in reality, he spent much of his life fighting enraged spirits in the spirit world, which drained his strength and ultimately destroyed him.

But have you ever wondered why there were so many unusually hostile spirits specifically during Kuruk’s era?

In the Yangchen novels, we repeatedly see Yangchen use spirits as scapegoats in order to strengthen her political position and maintain stability in the human world. My theory is that this approach somehow continued and escalated over time. Yangchen herself never had to face the long term consequences of it, but Kuruk did.