This chapter argues that the author's earlier argument for the claim that the new nominalist conception of concept-identity significantly contributed to the emergence of what became known as "Demon-skepticism" after Descartes, needs to be supplemented by further considerations concerning the type of modalities involved. More specifically, the possibility of the "full-blown, solipsistic Demon-skepticism" envisioned by Descartes requires, besides the nominalist conception of concept-identity clearly present in Adam Wodeham's work, the type of non-S5 modality espoused by Descartes which was still not endorsed by Wodeham.