Geological / environmental event
In the Umbricrealm Dominion, a series of seismic tremors causes several sky islands to dip lower in the skies, reshaping the landscape and creating new opportunities for exploration.
The Umbricrealm Dominion experiences a phenomenon known as the "Great Deepening." Over the course of several months, seismic tremors cause several sky islands to sink lower in the skies. While the event is not catastrophic, it reshapes the Dominion's landscape and opens up new opportunities for exploration and settlement on these lowered islands. Adventurers and treasure hunters flock to these new regions, seeking to uncover the mysteries hidden beneath the clouds.