Shalltear - Movement Impeding Penalty

As he bowed, Ainz nodded confidently. “...Understood.” Then he turned the slit in his helmet to Igvarge. “We’re leaving as soon
as possible—vampires receive a movement-impeding penalty in daylight.”

“‘Penalty’? Well, it is their weakness, and they do move moreslowly. We can be ready right away.”

***

Volume 3, Chapter 3.3