Cold Iron Haladie

Haladie are double-bladed polearms that rely on the user's dexterity to keep them in constant motion.

This weapon is made out of cold iron, which is toxic to fey creatures. When you hit a fey creature with this weapon, it deals an extra 1d6 force damage. The fey also has disadvantage on saving throws to avoid being banished or otherwise returned to the feywild until the end of your next turn.

Special: Whirl. When you are wielding the haladie in two hands, you can use a bonus action to attempt to whirl the weapon. To whirl, make a DC 10 Dexterity check, adding your proficiency bonus if you are proficient with haladie. On a success, you gain a +1 bonus to your AC until the start of your next turn, the whirling blades acting as a barrier against attacks. On a result of 15 or higher, you gain a +2 bonus, instead. On a failure, you deal slashing damage to yourself equal to your proficiency bonus and gain no bonus to your AC from the whirl this turn.

Finesse: When making an attack with a finesse weapon, you use your choice of your Strength or Dexterity modifier for the attack and damage rolls. You must use the same modifier for both rolls.

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, haladie Source: Tasha's Crucible of Everything Else - Volume 1 p. 67 (Homebrew), Heliana's Guide to Monster Hunting - Part One p. 122