The man swung his massive sword in a wide arc. Erik bent down and avoided the attack, but the man then unleashed a storm of slashes, giving Erik some trouble.
The man was not just strong; after all, that sword had to weigh a ton; he was also fast. Almost as fast as him.
That combination of speed and strength undoubtedly made the guy capable of ripping through Erik's armor as if it were paper.
It was a blackguard, after all, and these guys didn't have lame brain crystal powers, no matter how simple they might appear.
It was very likely that his native brain crystal power vastly increased his strength, and that was why, while the power was relatively simple, the blackguards got him into their organization.