Great Old One
Psionics. Molecular Agitation, Molecular Manipulation and Molecular Rearangement. Mentions molecules, which don't happen without atoms. Heck, Body Weaponry in the 1e PHB mentions altering molecules as well.
Ah, OK, options that I don't care about, psionics is SciFi (except Dark Sun) and so are molecules. Nothing core, which is what I remember. It's all very round-about.