Fly, Big (5e Equipment)
From D&D Wiki
Wondrous item, uncommon (requires attunement)
A burlap sack, filled with lead pellets and crudely altered to look like a fly. Can be activated as an action by tossing into the air and saying its command word, causing it to slowly float around you. The fly has 25 hit points and an AC of 5. Attack rolls targeting you are made with a -3 penalty. If this penalty causes an attack that otherwise would have hit to miss, the attack hits the fly instead. During a long rest, you can patch the fly up for 1d2+1 hit points.