I was thinking it was the cube thing shown at the end of the previous chapter, so it probably isn't over with just the staff... unless the cube changed into the staff off panel?
I'm assuming the cube things are directly controlled by the staff, since it has a similar aura with all those black characters that initially infected Behemoth and were swirling around the cubes.
And, it looks like there's a similar construct at the head of the staff, making it potentially a nexus point so this guy can control everything from wherever he is.
Destroy the staff, destroy the nexus point, turn off all the cubes - and maybe it'll render the Creepypasta "inert", if not outright destroy them, which should hopefully save & return the consumed yokai.
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I'm more than assuming the antagonist will escape--no shot this dude isn't going to be a recurring villain,
unless he's somehow a random low-/mid-tier mob taking orders from some higher entity, which would make him much more expendable.
But like
@TL-Law said, saving the yokai takes priority. So.