Scimitar of Speed [Скимитар скорости]
Оружие (скимитар), very rare
Recommended cost: 5 001-50 000
Weapon (scimitar), very rare (requires attunement)
You gain a +2 bonus to attack and damage rolls made with this magic weapon. In addition, you can make one attack with it as a bonus action on each of your turns.
Source: D&D System Reference Document 5.1, © Wizards of the Coast LLC, licensed under CC BY 4.0.