>>41432271That seems more like endgame boss/legendary material than a constant theme, though you could pull a bloodborne and ease them into the lovecraft and use it as an origin for the creatures. Would certainly enable a few interesting designs. Could even add a mental stat alongside the typical defense/attack/etc for an alternative way to fight. It'd start with simple fear/confusion effects and eventually hit "You cannot comprehend" stuff for endgame mons specializing in mental damage.
>>41432568To avoid fakemon syndrome I'd suggest going a little outside the box with types and stats and stuff. Put in some unique ones like sound, space, or weird stuff like that.