After having spent so much time with Stella, Gravis decided to commit to the last push.
He already knew three of the four main Laws.
He already was a level nine Divine God.
His Will-Aura had already reached the power of a Heaven's Magnate.
There was nothing left but the Law of the Dead World, the easiest main Law.
Of course, Mortis helped Gravis in comprehending the Laws. They would fully focus on the Laws, and they would only occasionally come back to take some breaks.
Gravis went on to finish the Mixed Elemental Laws related to Zero, while Mortis focused on the Pure level nine Elements.
By now, Gravis' comprehension speed had been pushed to the absolute limit.
He had the strongest Spirit available since he was a level nine Divine God.
He had Mortis.
He had Elemental Synchronicity.
And lastly, he knew all the other main Laws, which gave him a terrifying amount of experience when it came to comprehending Laws.