Is Khem Val really eating Forceusers or is he just consuming their essence?
I always imagined him just feeding on their soul rather than physical eating.
It would pair well with his forceimmunity. In the SI storyline we learn that the Rakata lost their connection to the force and felt so empty without it, that they were trying to rebuilt their connection with since. Maybe absorbing force-essence is the Dashade way of filling the void the force left.