[Blissey]

This is a pretty back-burner idea, but it'd be great if Black Eclipses actually happened every 3-5 years as stated in lore. Functionality-wise, Corrupted would feel all emotional intensities at once during this period, and Human characters could "feel a changing sensation" and perhaps get the option to convert into a Corrupted race (that wouldn't require Legend Extending). Also, due to the Black Eclipse, we could even get Black Beasts attacking all points of interest at the same time to further enhance the severity of the situation.

Just a thought.