Just prior to sending multiple slashes of mana made from the sword element, and manifested dozens of blades before launching them directly at Milo, the undead had extended the circle created through his unique battle art, stretching it right over the living to prevent him from defending himself with any energy whatsoever, in essence, Milo had just received the full brunt of the damage with his mundane body.
A body far more powerful than normal, but that was still plenty vulnerable to energy-based attacks.
The corpse almost found it too easy, striking at targets that could literally not defend themselves guaranteed that severe damage would occur, and as long as he maintained his art, they wouldn't have access to regeneration either, unless they somehow had a naturally high healing factor that is.
Stripped down of his magical capabilities however, Milo was just a human.
