After Brion finished combining two laws into one law, He started meditating waiting for the improvement of his level, It should be not take too long, At least that was what he was waiting for.
" 10 Years Later "
Brion, meditated for about ten years without even sleeping or something to pass the time when waiting. This was a little bit different from the normal time or not like combining two laws into one law, This kind of improvement was important for the mind and body power of Brion.
This is why it took take long and even if Brion wanted to pass the time, He can not do it because it needs Brion to be awakened when upgrading is on the way.
In a way it is a good thing for the mind power of Brion, both because of the fact of he was waiting and meditating for improving purposes and meditating improves his mind quality and soul ability, It lets him think easily and use his powers with more purpose.
