If it was just the siege crossbow arrows, with the strength of the black-armored knights, most of them could block the arrows from 50 meters away. However, there were even more arrows. The arrows shot by Rhodok snipers were mixed in with them. If the black-armored knights wanted to easily block the arrows, it would be more difficult.
Moreover, besides the archers, there were even more terrifying mages from the Enfath Empire who attacked these black-armored knights. Their spells were truly extraordinary, their attack strength was no less than that of the Swadian royal knights and the Sarleon Lion Knights.
As for the black-armored knights' armors and helmets, although they had been added with abyssal magic iron, the amount added was very little. The resistance of their armors and helmets to spells could only reduce the power of spells by three levels.