Black Dumpling is one of many Helms in Elden Ring. I don't recommend eating it, but the piece of armor serves a unique function in FromSoftware's open-world title.
How to get the Black Dumpling Helm – Super Rare Helm – Elden Ring
In Elden Ring, you can focus on bleed builds, strength builds, magic builds, and a variety of other best builds to make even the toughest bosses cry. One of the most unique approaches players are using is encouraging the madness effect to consume them.
Personally, madness/frenzy side effects have always tarnished my experience with Souls games (pun intended). But if you're up for that approach, Black Dumpling is a great help.
The Black Dumpling Helm is a random loot item often found in Volcano Manor, in a busy area next to the Guest Hall Grace.