The Minecraft Wiki is no longer considered as official by Microsoft and therefore several changes are required to be made, including to the wiki's logo. Please read this announcement for more information.
The cauldron armor was first revealed in the Spookier Fall article as a Minecraft Marketplace item under the name of the "cauldron cover". The article stated that the cauldron armor and the cauldron cover were both based on the Corrupted Cauldron.
When worn, it is oftentimes seen shaking and moving its eyes and small handles on the side. The helmet also moves as the stick stirs the purple liquid atop it. It leaves a bubbly purple trail when the hero walks around with it.