Also known as the Smoldering Duke, Ehkahk is a powerful smoke Mephit. His keen mind and charisma have persuaded many creatures of other races - including smoke+paraelementals and genies - to accept his leadership.
Ehkahk dwells in a floating iron castle in the Paraelemental+Plane+of+Smoke called the Choking Palace.
Sources
1E MotP page 53
Planescape Campaign Setting, A DM Guide to the Planes, page 32
The Inner Planes, pages 89 and 90
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