Imhullu, Flail of Keranos

Weapon (flail), artifact (requires attunement)

Flail of storms. This magic flail grants a +3 bonus to attack and damage rolls made with it. When you hit with an attack using it you can add your wisdom and intelligence modifier as lighting, bludgeoning, fire, or cold damage.

As a bonus action you can spin the flail. Pick an effect from the list:

1. Hurricane. Everyone in a 10ft cone must make a DC12 strength check, if they fail they are pushed back 10ft, on a successful check nothing happens.
2. Lightning. Your next sucessful attack this turn chains the lightning damage from flail of storms to the nearest enemy within 10ft.
3. Sand. Creatures standing in a 10ft radius around you must make a DC12 Constitution saving throw. On a failed save they are blinded until the beginning of your next turn as long as they remain inside of the radius, on a successful save nothing happens.
4. Blizzard. Creatures within a 10ft radius are protected by a shimmering field of ice particles. Increasing their AC by 1.

Blessing of Storms. If you are a worshiper of Keranos, you gain all the following benefits for which you have the required piety:

Piety 10+. The flail has 1 randomly determined minor beneficial property.

Piety 25+. The flail has 1 randomly determined major beneficial property.

Piety 50+. The flail has 1 additional randomly determined major beneficial property.

If you aren't a worshiper of Keranos, the flail has 2 randomly determined minor detrimental properties.

Ravaging Storms. You must be attuned to Boots of Stormy Clamour and a Belt of Storm Scion's Power for the following effects. You can use your action to concentrate on one of these effects for up to 1 minute. Friendly creatures are immune to any negative effects that occur. The same effect cannot be chosen again until after a long rest.

These effects include:

Hurricane. Create 5 tornadoes placed wherever within 15 feet of you. When a creature enters within 5 feet of a tornado for the first time on a turn or starts their turn there, the creature takes 1d8 bludgeoning damage and is pushed 10ft in a random direction. If they collide with anything both things in the collision takes 1d8 bludgeoning damage. Each tornado can damage the same creature on a turn and can be moved 30ft each turn separately.

Lightning. Your attacks with this weapon cause chain lightning at a 6th level to emanate from the flail (DC 15). First turn: the lightning surging from you grants you 1 additional attack action.

Sand. Create a 75ft radium sandstorms centered on yourself. The first time a creature enters the sandstorm on a turn or when they start their turn in the sandstorm, they must make a DC15 Constitution saving throw. On a failed save, they take 5d8 fire damage and are blinded until the beginning of their next turn. Sucessful saves incur no blindness and receive half the damage.

Blizzard. A 75ft radius area is covered in the effect of the sleet storm spell. All friendly creatures within a 75ft radius gain resistance to fire damage, and +2 to ac and Dexterity saving throws.