Bari-Bari No Mi in Dnd 5e
Eating a Devil Fruit
A Devil Fruit is a permanent legendary consumable item only one of which exists in the world at a time. When you eat a Devil Fruit you automatically attune to it, only one bite is required and only the first person to eat it gains the benifits or curse. You can "Feed" a Devil Fruit to a weapon by extracting some juice from the fruit and marinating it for the time normally required to attune. The weapon immediately requires attunment if it didn't before, if the weapon required attunment the weapon now requires two slots of attunment. This weapon doesn't count as magical, but retains any features from before consuming the Devil Fruit.
Features of a Devil Fruit
When a Devil Fruit is eaten you gain the following features. If you eat a second Devil Fruit you disentagrate and the Devil Fruit respawns somewhere in the world. Even if you are brought back by a spell you lose the Devil Fruit.
Feature: Cursed By the Sea
You become Incapacitated and immediately begin sinking at 60ft per round while up to your waist in seawater.
Damage
Your melee attacks, or attacks with a weapon which has consumed this fruit deal an extra 1d6 + the wielder's Proficiency Force damage.
Spellcasting
You can cast Wall of Force at 5th level at will, requiring no material components but requiring Concentration as normal. You can also cast Shield at 1st level at will. These spells can be cast using a weapon which had consumed this devil fruit using the same action or reaction that the spell would normally require.