Apshai was once one of the primary places where the nightmare servants of the Sea King Empire were created and fostered. Its very name struck dread in the hearts of the enemies of the empire.
The land around the temple was corrupted. Blisters and fissures erupted in oozes and slimes.
Knowledge broken down by ease of discovery/prominence.
If nothing is indicated, assume Common Knowledge.
Most Recent Stirrings
There is much concern across the realms if the Gwinnish forces ever try and reclaim the Sea King Empire that places such as these may become active again.