longbow, rare (requires attunement by someone proficient with longbows)
Damage Type: Piercing
This longbow grants a +1 to attack and damage rolls made with this weapon. In addition arrows fired from this bow count as magical, and are imbued with lightning that deals a further 1d4 lightning damage.
In the hands of a Ranger, a successful attack with the Stormbow can also deliver spell like effects when the Ranger consumes one of their spell slots to fuel the power of the bow (new spells may be added as the ranger levels and gains access to higher level spell slots).
Lightning Surge (level 1 spell slot)
Your attack deals an additional 1d10 Lightning damage. Each creature within 5 feet of the target must succeed on a Dexterity saving throw or take 2d6 lightning damage.
Thundershot (level 1 spell slot)
A wave of thunderous force sweeps out from your target. Your target, as well each creature within 5 feet must make a Constitution saving throw. On a failed save, a creature takes 2d8 thunder damage and is pushed 10 feet away from you. On a successful save, the creature takes half as much damage and isn’t pushed.
In addition, unsecured objects that are completely within the area of effect are automatically pushed 10 feet away from you by the spell’s effect, and the spell emits a thunderous boom audible out to 300 feet.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.
Zephyr Strike (level 1 spell slot, requires concentration)
You can cast this spell upon yourself as a bonus action. You move like the wind. Until the spell ends (up to 1 minute), your movement doesn’t provoke opportunity attacks.
Once before the spell ends, you can give yourself advantage on one attack roll on your turn using the Stormbow. That attack deals an extra 1d8 force damage on a hit. Whether you hit or miss, your walking speed increases by 30 feet until the end of that turn.
You can also use an action to cast one of the following spells on any arrow fired from this bow without using any spell slots: Light, Locate Object (5 mile range, 10 minute duration), Misty Step (see below).
Misty Step: as a bonus action you can cast Misty Step and teleport to the location (or within 5 feet of it if the target location is occupied) of your last arrow fired as long as it has been no more than 1 minute.