The three specialties rewarded for reaching Godly Dexterity were already known by Marvin.
They was [Extreme Nimbleness], [Extreme Speed] and [Extreme Burst].
Their descriptions were very simple. Marvin's Dexterity already reached the human limit. His flexibility when controlling his body reached the extreme. His speed and his burst power both reached the limit of what a human could do.
In other words, his Dexterity already reached the [Limit Bottleneck].
To break through this bottleneck, the simplest way was to ascend. Otherwise, it would be more difficult.
It would take a long time to examine.
But Marvin wasn't worried, as he still had some methods and experience he could use.
...
Regardless, 30 Godly Dexterity gave Marvin frightening power.
He had this kind of attribute at level 18. Even Shadow Thief Owl's Dexterity was at most on par with Marvin's.