My NR research has failed to yield a new glyph discovery for 4 straight times. I thought this had meant that I had learned them all but I realized I am missing at least 1 (of course its one i need), glyph of nourish. Are some glyphs taught thru mastery books only? I don't want to keep wasting mats on research if I'm going to continue to not learn new glyphs. I wonder if the 4 in a row streak was a crazy fluke or what.