Bugg-Shash is physically very similar to a Shoggoth, being a great, black, gelatinous mass covered in countless shifting mouths and eyes. He is known to use his amorphous body to overwhelm mortal creatures, enveloping them in waves of slime then taking control of their dead bodies in order to continue his work. As Bugg-Shash is unable to tolerate the touch of any form of light, he commonly employs these flesh-puppets to perform his bidding in places that his weakness would normally prevent him from reaching.
- Rising with Surtsey (1971), by Brian Lumley.
- The Kiss of Bugg-Shash (1978), by Brian Lumley.
- Elysia (1989), by Brian Lumley.
- Demoniacal (1996), by David Sutton.