The authority of the paracausal power that the body of an Elder God was just too superseding, removing any kind of foreign affect applied to the physical vessel, which might cause a huge problem in the future because even having Vesse himself casting the psycast formation on his own body through the guidance that Nagan's soul extension gave still really couldn't bypass this restriction.
And when using the {Primordial Wrath} to lace the psycast formation, it turned out that a hint of the expurgating forblack possessed the same intimidation factor, so the expurgating energy counteracted the psycast formation from actually taking a proper effect.
