In return for that, William would waste lots of time in return, and would produce a smaller number of grenades in the end.
Yet he used a few tricks and skills of hammering the melted ores, using all his might and boosting his speed with his lightning element. The task that'd usually take an hour or more to do was done in mere minutes.
He already expected that. So, he took out more ovens at first, and started melting down lots of ores, making use of all ovens all the time.
His spirit power was much higher than the last time he forged, and that was why he didn't feel tired as fast as before. At the same time, he wasn't that poor master, one without resources, potions, or elixirs. Whenever he felt his spirit power decreasing to a low level, he'd use a potion to raise it up.
As he got absorbed in doing this, two days passed. In the end, he made up tens of thousands of ball shaped items, each one was the size of one's closed fist.