Arash, bow of Great Winds

You have a +3 bonus to attack and damage rolls made with this magic weapon.

Howl of the Great Winds
the bow does 1d4 extra damage determined by the biome around you.

South wind- desert, steppes, savannas, etc
fire damage

North wind- tundra, arctic, mountaintops, etc
cold damage

East wind- forest, temperate grasslands, swamps, etc
lightning damage

West wind- coastal biome, seas, lakelands, riversides
thunder damage

You are always aware of the cardinal directions, and animalistic elementals are friendly to you unless provoked.

Gleam of Smokeless Fire
Once per long rest, as a bonus action, you cause the bow to glow with bright light as the elemental Pure Flame burns inside. For 1 minute, the bow does 1d8 extra of the elemental damage, to a total of 1d8, 1d4 extra damage. For this duration, you can also force the elemental damage to change to a Wind of your choosing. After you have used this feature, the bow does no extra elemental damage until the next dawn.

Great Winds unleashed
Once per long rest, you can grant the boons of the great winds to yourself, your mount or a vehicle you are using. For 1 hour, the target's movement speeds and jump distances (if it has any) double. This boon cannot be used in combat and is lost if you are required to roll initiative.

Golden Shot of Kamangir
You impart your own life into the arrow, which turns golden with divine power. As you let loose the arrow, both you and an enemy within the maximum distance of the bow's range die, not to be revived by any magic short of the Wish spell.

Proficiency with a Longbow allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, Damage: Fire, Requires Attunement, Damage, Combat, Ammunition, Heavy, Range, Two-Handed, Slow