Merlin was already a fourth-form shifter. This time, he was entering the Nourishment Pond merely to boost himself to the peak of the fourth-form.
A Host had to rely upon a Nourishment Pond to progress. Therefore, with the Nourishment Pond formulae and materials the Princess Royal had given him, enhancing his capabilities to the peak of the fourth-form was not an issue. It was just that it required a longer duration.
One day, two days, three days…
Only after ten days did Merlin walked out of the laboratory. There was no longer any point in him using the Nourishment Pond as he had reached a bottleneck. If he wanted to break through to the next level, he would have to become a full-shifter.
Regarding full-shifting, Merlin's understanding was too limited. If he wanted to learn more, he could only rely upon experiments and some luck.
