The Fathomless Mastery is the third full-length album by Swedish death metal band Bloodbath, released on 6 October 2008 via Peaceville.

[7] A video was made for "Hades Rising", directed by Owe Lingwall and shot on location in Vallentuna, near Stockholm.

[9] The album was reissued in 2011, bundled together with the tracks from the Unblessing the Purity EP released in 2008.

[10] 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.