"Stabilizing… 99%"
"The body of the host already stabilizes and right now it could handle the evolving Nectar."
"Evolution begins… 40%"
"... "
"... "
" The Red nectar Already upgraded to Dark Gold nectar. As the host takes the nectar for the first time this was the reward from the system but after that he will not receive reward when he will take more nectar."
".... Now transferring the strength to the soul state of the host to give him the power to break through the barrier."
" Transferring…1%"
" Transferring… 10%"
So as you can say his system right now helped him to transfer the power of that nectar into his soul state after upgrading his whole potential and not only that at the same time many things also changed in his body that Allen was completely unaware of.
