You’ve learned to put enough force behind a warhammer strike to send the impact through the ground itself, splitting the earth and throwing anyone caught in its path off their feet.
While wielding a warhammer, you can use your Action to smash the ground and create a fissure in a 15-foot-long, 5-foot-wide line extending from you. Each creature in the line must make a Constitution saving throw against a DC equal to:
8 + your Proficiency Bonus + your Strength modifier
On a failed save, the creature is knocked Prone and cannot stand until the start of your next turn. On a successful save, it keeps its footing and suffers no additional effect.
The fissure itself is primarily a shockwave and does not permanently destroy the terrain unless the DM determines otherwise.
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