Merlin didn't tell anyone about his complete accumulation of low spirit energy, not even Tara or Nier.
Because his development was too fast. He didn't want them to be suspicious of him.
Luckily, people would not know one's spirit energy, if it was not revealed. Just like Tara, if Nier had not said that she was Master of Spirits, Merlin probably wouldn't have known. Because unless in combat mode, these Living Humans would not release their spirit energy.
With Merlin's spirit energy now, he was able to forge the Spiritual Weapons a fifth time.
After Merlin's crossbow had been forged five times, in addition to the shiny surface, it also had a faint white aura spreading out. It was the appearance of a Spiritual Weapon that had been forged five times.
Merlin then began hunting high-level Spirit Beasts.
He had to venture into the depths of the forest and stray away from the village's safe zone.
After traveling almost fifteen miles, he finally found a high-level Spirit Beast.