@Armok Yeah, I have no idea what's adding them either. The modpack doesn't contain FU, as you say. Come to think of it, there should be a way for me to unpack the entire modpack so I can have a look, but I will do this at a later time.

my mod presently only adds in the Impervium Plate yeah, any other instance of Impervium is from betabound, FU, or possibly even some other mod. I am intending to add (or rather enable) Prisilite stars too in the future, otherwise my mod doesn't add any of the other materials present here