Mastery. Each weapon has a mastery property, which is defined in the Mastery Properties section later in this chapter. To use that property, you must have a feature that lets you use it.

Trident: Topple

If you hit a creature with this weapon, you can force the creature to make a Constitution saving throw (DC 8 plus the ability modifier used to make the attack roll and your Proficiency Bonus). On a failed save, the creature has the Prone condition.