Desert Wind
Weapon (greataxe/longsword), uncommon (requires attunement)
As a bonus action while wielding this weapon you can split the greataxe into a shield and longsword, or merge them back into a greataxe. You don the shield in one hand and wield the longsword in the other hand as part of the bonus action to split the weapon. This weapon has the heavy property in both modes. You are proficient with this weapon and shield if you are proficient with greataxes.
This weapon has 7 charges. Once on each of your turns, you can expend one or more charges to activate the elemental wind engines inside this weapon and extend the reach of your next attack by 10 feet for each expended charge. This attack deals thunder damage instead of the weapon's normal damage. This weapon regains 1d6 + 1 expended charges daily at dawn.
Forged by ancient artificers who harnessed the power of the desert wind to fuel their weaponry, this feat of engineering provides brutal force and crucial protection alike.