See the Dark Tempter in Venusian Apocalypse and the Apostles in the Dark Soul source book. They're pretty much the Dark Soul's physical manifestations.
There may be others, still imprisoned by the Ancients, or in suspended animation and biding their time. And there's the Necrocity's sarcophagus. The Dark Soul is pretty much extinction level damage - the Ancients couldn't defeat it - and exists outside the known universe.
Silvershield GM. Achtung! Cthulhu, Infinity, and Mutant Chronicles freelancer.
Embroiled in all of the Mutant Chronicles 3e books in some way, occasionally as a writer.