Stormseeker Bow

While attuned to this item, you are proficient with it. You learn the spells Lightning Bolt and Lightning Arrows, and can cast each spell once without consuming a spell slot per long rest. Additionally, you can spend a bonus action at the start of your turn to gain advantage on the next attack roll you make with this weapon this turn, and convert damage to lightning damage.

When you make an attack with this weapon, you can cast either of the spells gained from attunement as part of the attack. If you cast Lightning Bolt in this way, you can cast the spell as if source location is the target of your attack. If the attack is a hit, the creature has disadvantage on the DEX save to avoid the spell's damage.