|"Yeah, that's a flaw."|
|Purpose||To drain the gloom away from the Glooms|
|First appearance||"Delight Me, Delight Me Not"|
The Gloomnotium is a gem found by Bashful inside the mine in "Delight Me, Delight Me Not" and later used it to defeat Hildy and Grim. The gem can only be used on the Glooms, and it when it does it causes them to have very sickly sweet personalities.