You can hit a creature with another creature.

You gain the following benefits:

• When you take the Attack action and successfully grapple a creature, you can use a bonus action to make an improvised ranged attack using a grappled creature as the weapon. This attack uses the same ability modifier as the primary attack. The weapon’s damage die for this attack is a d6, and it deals bludgeoning damage to the grappled creature and the target.
• Your strength is increased by 1.