You've learned how to utilize the heft of your weapon to strengthen your blows greatly. You gain the following benefits:

• When you hit a creature with a light hammer, warhammer, or maul, their AC is reduced by 2 until the start of your next turn. This effect does not stack with itself.
• Attacks with hammers gain the siege property. When attacking structures or inanimate objects, your damage is doubled.
• On a critical hit with a hammer, your strike creates a shockwave. The target and each creature adjacent to it, excluding yourself, must make a Strength saving throw (DC 8 + your proficiency bonus + your Strength modifier) or fall prone.