Noah had some sort of inspiration after his continue deductions and a week of battles.
He was aware that his inscription method wasn't suited for the creation of diagrams and techniques but it was amazing at creating items.
He didn't know yet how he would solve that issue in the future, spells needed diagrams after all, he wasn't ready to give up on their creations.
Yet, he knew that, for now, if he wanted to create a cultivation technique, he had to forge an item.
The inspiration came after his repeated use of the Black hole spell in battle, that spell was able to absorb enemy's attacks, destroy them, and direct the energy contained in them in the body of the cultivator who could use it in its next attack.
'A black hole is an unthinkable amount of mass concentrated in a small space, it is even able to curve the light due to its immense gravity… That might be the right path to follow to create a cultivation technique.'