Becoming stronger had made William forget what creating Spells used to be like. Magic was like second nature to him now, but back in the Gravitas Ruins he had once beheaded himself while trying to learn the functions of the Space Element.
Other Elements had similar impacts. The Fire Element was easy to visualize and was William's first Affinity, but it also taught him about Mana Sickness and the dangers of upgrading Elements if his body wasn't strong enough.
Chaos reminded William that even his own power could turn against him if he wasn't careful, and Order spoke volumes of the Elements' intelligence, and that they weren't as two-dimensional as they seemed.
One thing was consistent across all Elements, and that was visualization. Without it, William wouldn't be able to cast a single Spell. If he didn't visualize the flow of Mana, he wouldn't be able to use it, and if he didn't visualize the Mana gathered into his desired form, the same would happen.