Bow of Waves

Weapon (longbow), legendary (requires attunement by a ranger)

This +3 longbow is made of fine yew with intricate carvings of waves and sea beasts carved into the wood.

Radiates: Conjuration magic.

Power: Your arrows deal an extra 1d8 thunder damage, or 2d8 in arctic or coast terrain.

Power: Once per day, you may use a bonus action to cause the bow to radiate with a roiling blue-green light. For the next minute, you have advantage on your attack rolls and the bow does an extra 1d8 thunder damage (2d8 in any terrain, or 3d8 in arctic or coast terrain).

Limit: You must have arctic or coast as a favored terrain to use this weapon.