Black Death

Black Death (黒死病) was a plague that existed in the World of 2138.

Overview
A highly lethal infectious disease, spread by rats, and was treated by specialists called plague doctors.

Trivia

 * In Overlord: The Undead Oh!, Demiurge dressed up as a plague doctor as a disguise at a Halloween party that also doubled as practice for infiltrating human society. When comments were made that his disguise would be less effective without a pandemic, Demiurge suggested that he could release the Black Death so he could walk abroad. It was a joke of course as he knew an outbreak would be detrimental to Ainz Ooal Gown’s plan for world conquest.
 * In real life, the Black Death or Black Plague that emerged in the 14th century Europe was considered to be the deadliest pandemic in human history.