How powerful is Promethium in DC Comics?

It is pretty powerful. The New Teen Titans v1 #9: Promethium in DC is explained. read more

Deathstroke used that armor while fighting Lobo and he still survived, Lobo being one of the most powerful characters in DC. But in another time, Lobo easily crushed a piece of promethium. So, in conclusion, I would say whenever the writer feels like making it strong, it's strong and sometimes, it's weak as iron or steel. read more

A new version of Prometheus debuted in New Year's Evil: Prometheus (Feb. 1998) and returned in JLA #16–17 (March–April 1998) and #36–41 (Dec. 1999 – May 2000). The character was then impersonated for a time by Chad Graham, but returned in Faces of Evil: Prometheus #1 (March 2009). read more