Spoiler Alert: WARNING! This page happens to contain a lot of heavy spoilers that are all originated from the Overlord author, Kugane Maruyama and his collection of written works. Anime-only watchers and Manga-only readers, please take some time off to reflect it over for a bit before choosing to expose yourself on reading the information below recklessly.
Total Calmness is a magic toy hammer.
This item was created by Pandora's Actor after he was informed by Yuri and Demiurge that he had given Ainz the wrong Total Maniac - Modified. His previous project had caused Ainz, several of the Pleiades and Floor Guardians to be afflicted with severe personality disorders.
Total Calmness appears similar to a typical child's toy hammer with a compressible red hammer head and a yellow handle.
Total Calmness is used to cancel the effect of Total Maniac - Modified. When attacked by this weapon, the afflicted will return to their original personality.