The dagger Nial was holding in his right hand was one of the weapons he had picked up from the two-element dungeons.
A few Ratmen had attempted to wield the weapons of the Originals they killed, which played into his hands.
Unfortunately, this was not the case for the Ratmen because it was the incident in which his Odyssey seed had released the eerie darkness that had shattered their dreams to wield a proper weapon, killing them even before they could use it.
However, Nial was able to make use of the dagger, ending the spar with Melvin in a draw, and dealt the final blow with the dagger, instead of the Viper spear Melvin had been fixated on.
Minutes had passed since the spar had ended, but both youths were still sitting on the ground, catching up their breaths as if they had just run a long, tiring marathon.