That One Time Qur Flattened Half of Apathae

The longest night brought about incredible destruction.

Our people tell stories about the plains across Qurain and Moonfal, about how they are fairly recent creations. They say the area was made roughly 1,000 years ago, when every mountain was crushed into gravel, every feature destroyed. That was when Qur flattened nearly half of Apathae, during the Longest Night.
Qur goes through daily cycles -- he creates and reshapes during the day, and then when it becomes night he glows brightly as he destroys and flattens all around him. Roughly a 1,000 years ago Cathedris experienced the perfect celestial event to set Qur into the longest destruction period he's ever gone through, known now as the Longest Night.
It was during the winter months in Apathae, when the nights were already longer than usual, when a perfect solar eclipse occurred. As the sun began to rise over the horizon, so too did He'an, perfectly matching the ascent of the sun and extending the night even further. Through an insane twist of fate, He'an's orbit perfectly matched that of the rising sun, keeping Qur's part of Apathae in darkness for the entire day.
That long, extended night set Qur into a rampage of destruction like none have ever seen, and hope to never see again.

— A story told by the Rillian people

Disaster felt World-wide

Flooding of Caed's Island

During his rampage, Qur ended up smashing the entire coastal mountain range of north-eastern Qurain into the ocean -- creating a massive wave, and even raising ocean levels by a few centimeters. Directly in the path of the wave was Caed's Island, where the lone God-husk Old King Caed rests. While Caed's broken throne had enough elevation to escape the wave, most of the rest of his island was drowned in a massive rush of water.

Landslides in Ezlya

The tremors from Qur's Worldshaper Cleaver striking the ground with unimaginable force were felt worldwide. The continent of Apathae was most impacted by it, but the vibrations dealt significant damage to the island nation of Ezlya as well, in the form of massive landslides.

Suffocation of North Apathae

The destruction wrought by Qur created a massive, continent covering, ash and dust cloud that drifted north towards Apathae's sister continent of North Apathae. Here the cloud remained, slowed by low winds and tall mountains, blocking out sunlight and drastically reducing air quality.