User blog comment:Zack Tan/Ainz's Possible Future Plans/@comment-27036174-20151012005029/@comment-202.134.122.130-20151012094249

- “Friend? That empty suit of armour over there is my friend… It’s all beaten up.”

- On the right shoulder of the armour was a hole, as if it had been pierced by a spear.

- “...The chances for it being just an unlucky encounter is high, but I could feel that the nature of that vampire was evil. And what a coincidence it was. Was the sudden encounter a bad luck, or was I lucky to have learned about their presence?”

- And the one in Vol 3 where Ainz thought there was another battle happened, and turn Shalltear into her Valkyrie mode.

So, Using spear, Strong Vampire with higher level than 13 heroes of the world. Those are the quotes, connect the dot yourself. believe what you want to believe, though many assumed PDL in his remote control armor met Shalltear fight with her and lose. resulting that.