Kai Hahto (Rotten Sound)
Steve MacDonald (Gorguts)
Asgeir Mickelson (Spiral Architect)
Flo Mounier (Cryptopsy)
Sean Reinart(Cynic)
Marcelo Ruiz (Coprofago)
Dennis Röndum (Spawn of Possession)
Dan Ford (Commit Suicide)
John Sankey (Devolved)
David Haley (Psycroptic, The Amenta)
Jordan Varela (Lividity, Lust of Decay, Domination Through Impurity)
Nils Feldstrom(Sanctification)
Mike Hamilton(Deeds of Flesh)
Arttu(ex-Aeon)
Brad(Devourment)
Robbe(Disavowed)
Gene Hoglan(Death)
Tony L(ex-Nile)
Missile(Vital Remains)

Necrophagist has some wicked drums as well but definately the highlight of Epitaph is the guitar , Onset of Putrefecation used a drum machine