The Fathomless Mastery is the third full length album by Swedish death metal band Bloodbath. Former Scar Symmetry vocalist Christian Älvestam performed guest vocals on the sixth track, "Iesous". The outro of the final track, "Wretched Human Mirror", features samples from the movie I Am Legend. A video was made for "Hades Rising", directed by Owe Lingwall and shot on location in Vallentuna, near Stockholm. The album peaked at No. 45 on the Heatseekers Chart in the US on release.