Pick up Suffocation - Effigy Of The Forgotten, much better than Pierced From Within.
Epic death metal ala Amon Amarth and peers isn't really my cuppa (although I do enjoy Nile, and have got all their full-lengths), but I suppose you could call Incantation - Diabolical Conquest epic (it's even got a 16 minute kick-ass song, a perfect climax for a close to perfect record). Immolation, too, can be called epic, I guess. Get Close To A World Below or Unholy Cult. Behemoth's latest offerings have been pretty epic too; check out Demigod, Zos Kia Cultus or Satanica if you're interested.
I would also recommend Decapitated - Nihility, Spawn Of Possession - Cabinet, Incantation - Onwards To Golgatha and Decimate Christendom, and Insision's "Revealed And Worshipped". Pretty brutal, but not quite as intense as Sepsism, Inveracity, Liturgy, Brodequin and the likes