Scimitar of the Swarm

Weapon (scimitar), rare (requires attunement)

You gain a +1 bonus to attack and damage rolls made with this magic weapon. While you have more than half your hit points, you also deal an extra 1d6 slashing damage to any target you hit with it. In addition, whenever you deal damage to a creature using this weapon, you can move normally through its space until the end of the turn, which isn't considered difficult terrain for you. If you move through a creature's space in this way, you don't provoke opportunity attacks from it as a result of your movement until the end of the turn; if you end your turn in another creature's space in this way, you're magically returned to the nearest unoccupied space you moved through before entering that space.

For those with murder in their veins.