
Terrenium power source in a Droom doll
Terrenium was a material used as a power source, though it could also become powerfully explosive under certain conditions. Such an explosion could be contained by tomohite.
Droom technology was powered by terrenium, and was thus banned in the Federation. In 2324, Lieutenant Rachel Garrett took advantage of the terrenium within a Droom doll to destroy Fuzz's shuttle. (Star Trek: Section 31)