Skulduggery Pleasant Fan Fiction: Impossible Reality

WARNING THIS IS SET AFTER DOTL AND WILL CONTAIN SPOILERS!!

"Stephanie, I know that you haven't been back long. But you
did say to tell you if anything strange happened in Haggard" Her mother inhaled,
"Does a man in black moving armour count?"
Valkyrie's eyes widened, "Are you sure that's what you saw?" asked Valkyrie as
she tried not to jump to conclusions.
"I'm looking at him right how honey. And it looks like the shadows are, moving around him"
"Mum" said Valkyrie as she tried to say calm, "Get out of there right now"

Lord Vile's in Haggard and both Skulduggery and Valkyrie
know something's off. Especially when Vile's armour is seemingly is two places
at once.
Is the Lord Vile in Haggard and impostor? Or is he something much worse?