Corn, Crown, and Conflagration

Epochs ago, a tribe prophesized that foreigners would plunder and dominate their land. The prophecy also warned that if the foreign aggressors did not atone for their sins of cruelty, theft, and murder, they would suffer from great fire and destruction. After five centuries of brutal occupation, a relentless virus with mysterious origins challenges the rulers. Will the repercussions of the invisible invader force the occupiers to make amends for their atrocities, or will the rulers be forced to suffer the prophesized conflagration?