'' Epimethus was the titan whom the prophecy was envisioned '' does this make sense?

No. "Whom" refers to the object or indirect object of a transitive verb: your sentence lacks any.
I assume you meant to say, "whom the prophecy foretold" or "who made the prophecy."
Prophecies can be made, but not, I think, "envisioned", although a prophecy can be conjured up in some one's vision..
 
"Epimethus was the titan whom the prophecy envisioned."

(the prophecy imagined Epimethus was the titan)
 
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