History
Epidurium is a metal even rarer than vibranium or adamantium, and a key element in the creation of the synthetic skin of Life Model Decoys.
While stopping a gang of truck hijackers, Hawkeye and Red Wolf stumbled across a massive accident on highway 51, a vehicle disguised as a coal truck contained numerous LMD heads and barrels of Epidurium. The heroes took a sample of Epidurium from a ruptured barrel before authorities confiscated the items on the truck, and brought it to Tilda Johnson to investigate its origin.[1]
The Wizard later used the rare metal to create his own army called the Frightful Four Hundred. The Vision was unimpressed by it though, calling it weak as he could phase through it.[2]