Borem of the Lake of Boiling Mud

Borem of the Lake of Boiling Mud was one of the Seven Lost Gods, possibly a primordial who remained on Toril after the split between Abeir and its twin.

History
In -359 DR, Borem became active after long years of appearing as a simple muddy river. After a hot summer, the river broke its banks and became a lake in the space of a tenday of rainfall. In their quest for godhood, the adventurers Bane, Bhaal and Myrkul attacked Borem in his home plane after making the connection between him and the river. Killing him, they stole his heart, which they bore to Mezeketh Isle and buried.