Ainz Piercing Immunity

“[Perfect Unknowable].”
Ainz, now an unknown, came out of the shadow of his tank, the Doom Lord, to circle around them. Suddenly, the katana flew towards him at a speed he could not dodge. It pierced through his robe at the abdomen region.
He did not take any damage due to his immunity to piercing damage, but Ainz still scuttled behind the Doom Lord’s figure. The katana, suspended mid-air, then began to slash towards the Doom Lord instead.

- Overlord; Vol 14; Chapter 4