As a bonus action, you invoke the wrath of Umberlee. (1/short rest)

Your next successful melee attack from the Stormtide Halberd creates a crashing wave of force. Each creature within 10 feet of the target must make a Strength saving throw against your Paladin spell save DC.

On a failed save, they are pushed 10 feet away and knocked prone. Creature that succeed the saving throw are not moved or knocked prone

SPELL SAVE 14 - STR