Boon Death is the Ghouled version of the Boon Doc. A Boon death is the exact opposite of a Boon Doc, since the Boon Doc heals and the Goon Death kills. The Goon Death made its debut in the episode "The Unbeatable Master". A Mega Morphed Goon death appeares on the poster for the Slugterra movie Ghoul From Beyond.
Dr. Blakk's Goon Doc killed Shinai.
- Protoform Abilities - Makes people feel ill when standing nearby.
- Medusi - Poison attack that will slow an opponent down for a short period of time.
- Creepsleep - Poison paralysis drops opponent into a temporary coma.
- Turncloak - Emits a ball of dark light that creates a zombie-like feral state. Slingers will start attacking allies.
- Ghoulgoyle - Hits an opposing slug and uses dark energy to transform them into a ghoul.
- leachfang -Kills the oppenent by using this