[@Turboshitter]Alright then Turbo how do you want me to change it then? I don't want to make the enemy berserker come off as a mary sue the floor buckling caught him off guard. Endurance isn't his defense stat in it's entirely either (Quickness and speed of reaction is all in agility) it's how much damage he can withstand have the ability to pierce and wound him doesn't mean he can't shake it off. Perhaps I am underselling the effect of the blow though. Endurance doesn't effect Durandal's ability to hurt it does effect how much pain the berserker can withstand. Negating magical defense and armor doesn't equal negating one's ability to take a blow.

Short story even shorter I can have him use one of either of his noble phantasm swords to block it. Regardless the blow should hit him at least once even slightly.