Xundi

 is a Marid that was freed from Algar Dyomin by Mighty Nein. As an NPC, is played by Matthew Mercer.

Background
Xundi mentioned to the Mighty Nein that they could find him in his home: the "Silver Silt Palace" in the "endless oceans".

Trivia

 * It is assumed that (since Xundi is a marid) the Silver Silt Palace is located in the Elemental Plane of Water.