Spoiler Alert: WARNING! This page happens to contain a lot of heavy spoilers that are all originated from the Overlord Light Novel series written by the author Kugane Maruyama. To every Anime-only watchers and Manga-only reader out there viewing this warning, please mindfully consider your decision first before choosing to expose yourself on reading the information below. If you're not currently up-to-date with the main source material in the official books, do consider staying away from the page for non-spoiler sake until you actually read it first ahead of time.
Pitcher of Endless Water (無限の水差し) is a magic water vessel.
He also used it to clean himself after crushing Clementine to death in his arms.
The pitcher was made of a crystal clear glass and it was soon filled to the brim with refreshing water. Because of the coldness of the water, numerous water droplets condensed on the surface of the pitcher.
This flask can produce a constant flow of pure water.
In the Manga, it didn't make an appearance.
In the official english release of the light novels, the pitcher is called the "Bottomless Pitcher of Water".