Plasma-density charge
Plasma-density charges are Decepticon bombs, planted covertly by facsimile constructs and detonated remotely. They may be used to ignite other, more explosive materials.
Fiction
2005 IDW continuity
When a seam of Regenesis ore was discovered beneath a dig site in Eden, Texas, Bludgeon sent Markham and Fleming to plant plasma-density charges near a pocket of natural gas close to the main shaft. When the charges detonated the gas the site was evacuated, allowing the Decepticons to move in and take the ore for themselves.
Once Bludgeon considered his mission complete, he used a plasma-density charge to destroy his base within Mount St. Helens. By tossing the explosive into the magma flowing inside the mountain, he triggered a massive volcanic eruption that erased all evidence of his stay on the planet. Spotlight: Soundwave
Plasma-density charges were used in the bombing that crippled Omega Supreme. The End of the Beginning of the World
