Hunter's Pitchscythe

Weapon (trident / halberd), uncommon

A bladed pitchfork with a head that unfolds into a scythe using a trigger on its handle. Based on a mechanical breakthrough meant to be the ultimate farming multitool, which would become the blueprint for future weapon innovations used by Hunters of the Beast Scourge. 

Trick Weapon. You can use a Bonus Action to transform this weapon from a trident to a halberd or vice versa. The DCs for any Saving Throws using this weapon’s properties equal the 8 plus the ability modifier used to make an attack with it plus your Proficiency Bonus. You can use the Transform Attacks of trick weapons a total number of times equal to your Proficiency Bonus before finishing a short rest.

Sowing Wound (Transform Attack). When you hit a creature with this weapon while in its trident form, you can use a Bonus Action to open its blades while within the creature, transforming it into a halberd. The creature must make a Constitution Saving Throw. On a failure, the creature loses 1d6 hit points at the start of its turns until it takes an action to staunch its wound.

Reaping Strike (Transform Attack). After you make an attack with this weapon while in its halberd form, you can use a Bonus Action to transform it into a trident and force the target to make a Strength Saving Throw. On a failure you can move the target 5 feet in any direction.

The Scourge of Beasts fell suddenly and without warning over the unassuming populace. With little formal military present, the citizens of that damned old town utilized what tools they could to defend their home against their transforming brethren. When the beasts were finally driven back beyond the gates, those who defended the town would form the first bands of Beast Hunters, furthering the engineering of transforming weapons in their workshops.