Flail Mastery

The flail is a tricky weapon to use, but you have spent countless hours mastering it.

You gain the following benefits.

You gain a +1 bonus to attack rolls you make with a flail and greatflail.

Flails and greatflails you wield replace the Weighty Swing property with the Crushing property. When you hit with an opportunity attack using a flail or greatflail, the target must succeed on a Strength saving throw (DC 8 + your proficiency bonus + your Strength modifier) or be knocked prone.