Flurry

When fighting with 2 one handed weapons, you gain the following bonuses:

• You attack with great speed. When you use your bonus action to make an offhand weapon attack, you may attack twice instead of once.
• Your wild attacks open up the opportunity to critically strike the enemy. When you attack the same creature more than once on a turn you critically hit on a 19 and 20 (this stacks with other similar effects).