I'm not the best when it comes to homebrewing magical weapons but I really want this to be in 5e. There is a sword from japanese mythology called Ame-no-urakumo-no-Tsurugi (天叢雲剣, "Sword of Gathering Clouds of Heaven") which was then later called Kusanagi-no-Tsurugi ("Grasscutter").
It is a sword that controls the wind, presumably by slashing at the air to direct a strong blow of wind.
In the legend Susanoo-No-Mikoto, the storm god, discovers it in the belly of the eight-headed snake Orochi, then through happen stance, it finds itself in the possession of prince Yamato who while on a hunting trip is betrayed by a local warlord who lights the grass around Yamato on fire in hope to kill him in what seems like an accident, Yamato sees he's trapped by the fire and starts cutting the grass around him to remove the fuel and that's when he finds out the sword can control the wind so using his trusty fire starters and his newly discovered magic sword Prince Yamato blows fire back at the would-be assassins, assassinating them instead.
Currently my design is...
Weapon (longsword) , very rare This yellow bladed saber with a green hilt can control the wind, sending a gush of strong wind in the direction of the strike of the sword.
As an action, a slash of this sword sends a 60 foot cone of wind in any desired direction. Any creature inside this cone must make a DC 12 strength saving throw being pushed back 20 feet and falling prone on a failure and just falling prone on a success. This pushes fire out of the cone's area unless it hits a wall, in which case it snuffs out. It also disperses fog. Air elementals and other non-corporeal creatures have disadvantage on this saving throw.
As such it has the following properties:
- It can be used as a reaction to give disadvantage on an attack roll with a ranged or thrown weapon attack.
- As an action, it can blow sand, dirt or snow in a creature's direction in a 30-foot cone that persists for 1 minute. All creature inside the affected area have disadvantage on Wisdom(Perception) checks that involve sight and a disadvantage on their attack rolls.
- It can increase the speed of a sailing ship by 2 miles per hour.
It doesn't work underground or anywhere where "wind" would not usually be.
I fear this item might be OP, want this to be on-par with a very rare item, as this is meant as a reward for a party of 5 level 10 players by killing the end boss (which is a dragon, further connecting it to the myth), Can someone please tell me if this weapon is overpowered, underpowered or not explained well enough?