[7] Metal Hammer praised the album, labelling Hellripper as "Scotland's king of the arcane mosh" and writing that the songs "stab and slash like newly minted classics beamed in from the mid-80s underground, but laden with contemporary oomph".

[8] Kim Kelly, writing for Vice, wrote that Coagulating Darkness "feels as much a homage as it does an original creation", and called it "bloody good black/speed metal".

They also appeared on the Worldwide Organization of Metalheads Against Nazis II compilation, alongside other metal bands such as Ghoul, Jucifer, and Immortal Bird.

McBain stated in an interview that the album's four songs were "more punk-influenced" compared to Coagulating Darkness, and that Joel Grind of Toxic Holocaust helped with the mastering.

Nick Ruskell, writing for Kerrang!, gave the album 4 out of 5 stars and praised the energetic tempo of the songs, calling it "a speedy, Satanic delight that exhumes the corpse of early-'80s thrash and black metal".

Warlocks Grim & Withered Hags gained positive reviews and debuted at 11th place on the UK Official Rock & Metal Album Charts.