You are getting them from unravelling stuff.Personally I got enough from doing mibs and hunting gargoyles for gems. Just get one spare bag, when you are hunting something and drop every magical item into that bag. (Though ... some ppl, who heavily farm, prefer to put only magical items with weight up to 3 stones into that bag. Otherwise they would become overweight too fast. Especially when hunting bigger game.)
Basicly you can get the 120's scroll from doing thethird quest at the soulforge. Only that it would require you to spend 50 relic fragments on it. Usually it is easier and cheaper to spend instead 500 essences on it. (Especially course you can train your skill with unravveling and magic residues only.)