The Honey Jar is an accessory that reduces damage taken by 20%. When used with the Honey Spoon, the ability, "Sweet!" is activated. When used with a healing Nano, health recovered is 100%.
The last time the bears of Jellystone ate their honey was when Fusion monsters invaded their home. They were so scared that most of them dropped everything, including their utensils, and ran away, never to return. This jar, as well as the spoon, was one of the things the bears left behind.