The Double-Bladed Scimitar can be found in Eberron: Rising from the Last War, page 21.
This weapon appears ordinary, but it bears strong illusion magic that allows its wielder to skillfully deceive opponents.
You have a +2 bonus to attack and damage rolls made with this magic weapon. While wielding it, you also gain the following benefits:
Fool's Feint
As a bonus action, you can feint, choosing a creature within 5 feet of you as your target. Until the start of your next turn, you have advantage on attack rolls against the target. Once this bonus action is used, it can't be used again until the next dawn.
Misdirect
When a creature within 60 feet of you targets you with an attack roll, you can use your reaction to require that creature to make a DC 15 Intelligence saving throw. On a failed save, the attack instead targets another creature of your choice that is within the attacker's reach. Once this reaction has been used, it can't be used again until the next dawn.
If you attack with a double-bladed scimitar as part of the Attack action on your turn, you can use a bonus action immediately after to make a melee attack with it. This attack deals 1d4 slashing damage on a hit, instead of 2d4.
This weapon requires two hands to use. This property is relevant only when you attack with the weapon, not when you simply hold it.