D&D 5th: Demon Tower of Madness
Two Weapon Fighting
When you take the Attack action and attack with a light melee weapon that you’re holding in one hand, you can use a bonus action to attack with a different light melee weapon that you’re holding in the other hand. You don’t add your ability modifier to the damage o f the bonus attack, unless that modifier is negative.
If either weapon has the thrown property, you can throw the weapon, instead o f making a melee attack with it.