Septimius Severus Eastern Imp VIII Denarii Classification

I have been properly classifying my romans. Now dealing with the denarii. As is often my luck I am stuck in one that I cannot find a RIC number for in wildwinds.

It is a Septimius Severus and style of the letters has me convinced that it is from the eastern issues. The obverse legend has one near reference, RIC 444var. But mine is IMP VIII instead of IMP II:
L SEPT SEVER PERT AVG IMP VIII

The reverse has a figure holding what seems a trident. And a legend I cannot understand. CERER is clear. The rest looks like ERVGIC but I make no sense of that. The last letter may be something else. The others I am quite sure of. I found reference to an issue with a CERER FRVGIF reverse. But this one certainly has an E at the start of the second part.

Is there a published list of known legends for these issues?

Was this eastern mint perhaps a traveling one where mistakes on legends were common?

Another possibility is an era counterfeit. The coin has a heavy black patina and brown corrosion products where is has some fractures. It might be a fourre. Have not yet got a good photograph, the patina on this one hampers it. Weight is 2,49 g.