Dismounting (5e Variant Rule)
From D&D Wiki
A weapon with the dismounting property is a polearm with a hook designed for pulling riders from their mounts.
When you use a dismounting weapon to Shove a creature, you can choose to gain advantage on the ability check, but this also means deciding before you make the check that on success the target will be knocked prone, not pushed. If you still fail the check, you drop the weapon.
|Goedendag||19 gp||1d8 piercing/1d10 bludgeoning||10 lb.||Two-Handed, Heavy, Dismounting, Special|
|Guisarme||10 gp||1d8 piercing||5 lb.||Heavy, dismounting, reach, two-handed|