The expected effect of a correctly inscribed rune was for it to glow brightly when formed and then disappear shortly afterwards.
Runes were not visible to the naked eye, even when one circulated mana in their eyes to observe them. Only an experienced Runemaster could see the runes of an enchanted artifact.
Liam wasn't that capable yet, so he could no longer see that rune he had inscribed until he raised his knowledge and/or level.
Soon, he embarked on the challenging task of inscribing the most difficult rune onto the bulb. This rune comprised three characters in total.
Was that a lot? No, but it was enough to make a beginner like him break out in a cold sweat.