Over the years, the line-up has consisted of former or current members of Greek extreme metal bands Rotting Christ, Necromantia and Septic Flesh.
The direction of the band is different from the members' main projects, which have used unpredictable streaks of atmosphere, melodicism and experimentation.
On the contrary, Thou Art Lord's musical approach is raw, unrelenting death/black metal, with lyrical themes of "apocryphal worshipism" and "Dionysian-influenced satanic philosophy".
In 2012, the original members, alongside El (Soulskinner) and J. Maelstrom (Ravencult), recorded and released a new song, Three-Headed Hydra.
Furthermore, the band has announced a collaboration with the Greek label Floga Records to re-release their first albums, Eosforos and Apollyon, on vinyl and CD format.