Heart of Darkling - DiTullio Islands (Patreon)

Several rivers run into the Darkling Lake - the vast underground "sea" at the end of the Darkling River. The Ditullio Islands are a small fishing community of mad derro tucked against the shore of the Darkling Lake where two smaller rivers enter it.

The DiTullio derro are paranoid and hostile to everyone, and often to each other. But they truly fear the aboleth lords who lurk in the darkest depths of the Darkling Lake. They have erected a number of small stone houses on their islands, and laid claim to a heavy stone tower that predates their settlement (likely crafted by magic as the stone is nearly perfectly smooth).

They fish on their boats when they seek solitude, but most of their food comes from the nets set to capture fish that come from the smaller river outlet which pours into the Darkling down a twelve foot waterfall. The constant sound of the waterfall only serves to heighten the paranoia of the Derro, but they dare not move away from it as it is their best food source.

https://rpgcharacters.wordpress.com/2018/07/12/heart-of-darkling-ditullio-islands/