Despite his feelings, Sylas felt that he had grown a great deal after exiting the Secret Realm.
If he applied the rules of Rune construction, then he would be able to draw Runes twice as fast with half the effort. In addition, the struggles he had with dealing with higher Stroke and Foundation Runes would be greatly diminished.
Before, it took him a great deal of time and effort to master his Slow and Freeze Runes, and they both only had 50 or so Foundations. But according to Nosphaleen, the limit of the F-Grade was 100 Foundations.
If you factored in the large leap in difficulty there was every 10 Foundations, Sylas had a hard time being confident in drawing a 60 Foundation Rune, even if he was given several days, let alone 70 and above.
But what he never realized was that there were rules to putting Runes together, almost like nomenclature for molecular formulas and atoms. There was an order to how things were supposed to go together.