Tempest (+1)

Weapon (Warhammer)

Legendary (Requires attunement by a creature of good aligment.)

A powerful weapon housing the spirit of a primal storm elemental. The thunder it creates makes the very foundation of the world tremble, and the lightning it summons put even the brightest stars to shame. One one side of Tempest is a hammer head which when striking booms with thunder and the other side is an axe head which

It deals 1d8 bludgeoning or slashing damage while being wielded with one-hand, and 1d10 bludgeoning or slashing damage when wielded with two hands.

It has the thrown property with a normal range of 30 feet and a long range of 60 feet.

When you make a successful ranged attack using this weapon, it deals an additional 1d6 lightning damage. Immediately after the attack, Tempest magically flies back to your hand.

The wielder can summon Tempest, and it will fly to their grasp from any distance, even across dimensions. The hammer navigates to you at a speed of 60 feet per round, taking the fastest route possible. If the hammer deems the fastest route back to your hand is through a wall or creature, the DM may have it do so, to their discretion.

The hammer has 3 charges, each of which can be spent to cast "Call Lightning" as an action or "Thundeous Smite" as a bonus action on your turn. The weapon regains one spent charge on a short rest, and all spent charges on a long rest.

Additionally, should this weapon be used to harm an innocent person, who has never taken another life, the wielder is deemed unworthy to wield this hammer until they complete a task to regain their worthiness the DM deems appropriate.

Trials

The hammer has more powers and abilities that the wielder must unlock through trials and hurdles that the DM determines. Keep in mind these do not all need to be unlocked in order, or even given out at all. You could possibly have the player wielding the hammer go retrieve related artifacts, doing deeds for a deity of storms, bringing rain to a droughted land, or whatever else you can come up with!

Stormbreaker

The wielder of Tempest can expend all of the hammers charges to cast the spell "Control Weather" as an action.

Eye of the Storm

The wielder of Tempest can expend two charges to cast the spell "Storm Sphere" centered on them, the effect moves with the wielder. The wielder is immune to the effects of Storm Sphere.

Stormchaser

The wielder of Tempest, gains a fly speed of 60 feet. But in order to fly they must maintain their grip on the hammer. If the hammer leaves their grip, they begin to fall.

Earthshaker

The wielder can slam the hammer against the ground in front of them and expend a charge to cast "Thunderwave" at 2nd level.

Bifrost

The wielder can raise the hammer to the sky summoning down a beam of primsatic light. This beam forms a 15-foot circle and transports all willing creatures in the space to the location of the wielders choosing. This location has to be somewhere the wielder has seen or been to. This also allows for interplanar travel.