Mento,
the Primal Letter—M—that he possessed
was classified under the Highest Will as a support type, mainly responsible for world creation and management. Its unique "Modeling Fluid" could also be used to repair teammates' limbs and construct temporary equipment.
However,
when Teacher Med, who had been as close to him as a father or elder brother and was also the one he respected most, was ambushed and killed by Goodman,
he resolved to personally execute this Uncontrolled One.
The execution would take place after the Black Tower had completely drained Goodman of his value.
Ever since his teacher's death, when he officially accepted the M Letter,
he would often Transform Into an ordinary person and travel through self-configuring worlds created by Modeling Fluid.
What he enjoyed most was sitting atop the highest peak of each world and using Mind Fishing.
Sometimes, he himself did not understand the meaning of doing so, but this calming act allowed him to quietly observe every detail of the world.
Until one day,
Mento entered an unprecedented meditative state while fishing.
Invisibly stirring the clouds and mist of the real world with his fishing rod, he comprehended the essence of "Modeling Fluid" and condensed a white solid of quality surpassing Modeling Fluid.
When he woke,
this solid substance was shaped like ore and hung from the fishing hook. There was one and only one piece.
If he wanted to obtain another such solid, he would likely need to enter that same peculiar state once more.
He did not seek the support of the Black Tower's highest technology,
nor did he ask the Black Tower's most experienced smiths or item craftsmen to process the substance.
Instead, he went to one of the lower worlds under his command and found a Blacksmith Shop in a village there.