Guardian Poleaxe

Damage (piercing): An advanced weapon that has the damage property can deal an alternative form of damage. You can choose the type when you attack or when you hit with an attack from any of the damage types mentioned.

Guard: Guard weapons allow you to fight defensively, using the weapon's long haft or flat surface for parrying. While you wield a guard weapon, whenever a hostile creature moves within your reach when you didn't move on your last turn, you can use your reaction to make a weapon attack with the guard weapon against that creature. If the attack hits, then it deals no damage, but the target immediately stops moving, and its speed becomes 0 until the end of its turn.

Hafted: A hafted weapon's haft can function well as an off-hand attack. When you attack with only the hafted weapon, you can use a bonus action to make a melee weapon attack with the haft. The haft deals 1d4 bludgeoning damage, and you add your ability modifier to damage as you would for other sorts of two-weapon fighting. If you have feats that mimic this ability, the damage dice becomes 1d8 instead.

Reach: This weapon adds 5 feet to your reach when you attack with it, as well as when determining your reach for opportunity attacks with it.

Tripping: A tripping weapon allows users to knock targets prone. When you hit with a tripping weapon, you can use a bonus action to force your target to attempt a Strength saving throw, provided the target is no more than one size larger than you. The DC for the saving throw equals 8 + your proficiency bonus + your Strength or Dexterity modifier (your choice). If the target fails, it falls prone.

Heavy: Creatures that are Small or Tiny have disadvantage on attack rolls with heavy weapons. A heavy weapon's size and bulk make it too large for a Small or Tiny creature to use effectively.

Two-Handed: This weapon requires two hands to use. This property is relevant only when you attack with the weapon, not when you simply hold it.

Proficiency: martial, halberd Source: Grim Hollow: Player's Guide p. 131 (Third Party)