The Fourth-Grade Divine Rune Yi Tianyun inscribed was of the simplest kind, and a miniaturized version at that, so creating it was very easy and took little time. However, regardless of how quickly it was made, it was still a Fourth-Grade Divine Rune. Even those who knew nothing about drawing Divine Runes could recognize it as such.
One could tell from the effect alone that it was, indeed, a Fourth-Grade Divine Rune! In truth, as long as someone could inscribe a Fourth-Grade Divine Rune—no matter how shoddy or useless—they could be called a Fourth-Grade Divine Rune Master.
This was why Elder Xuan had said that restoring the Flying Array would require a top-tier Divine Rune Master. A novice Divine Rune Master and an advanced one were on two completely different levels.
