Sutekh

The Oldest One was an unknown being that appeared to belong to the same Pantheon of Gods as The Toymaker and Maestro, it was unclear as to who exactly this being was but Maestro believed that the hidden song Carol of the Bells within the soul of Ruby Sunday which played on the night of her birth shared his power before they immediately dismissed the possibility when they stated frustrated "He can't have been there.", seeming perplexed as they tried to reason why he might've been. Finally saying that "this creature is very wrong." (TV: The Devil's Chord)