To come full circle on the volcanic theme of the last few days with the wand of ash storm and pyroclastic rod, if you've ever seen eruptions in places like Hawaii where the lava flows reach down and plunge into the sea in an explosive cascade of steam, it's one of the more dramatic bits of the power of nature you'll ever see. That blending of ocean and earth, of water and fire, inspired this magic item. It's not the kind of thing your hero might need every day, but it can be awfully handy in the right situation.
Wand of Aquafire
Wand, uncommon (requires attunement by a spellcaster)
This wand has 5 charges. While holding it, you can use a bonus action to expend 1 of its charges to enable you to see clearly at double the normal distance underwater (or up to 30 feet away even if you are in murky water or have no light source) until the end of your turn. In addition, you can expend 1 of its charges as a bonus action when you cast a spell that deals fire damage. Creatures and objects that are fully immersed in water do not have resistance to this fire damage.
The wand regains 1d4 + 1 expended charges daily at dawn. If you expend the wand’s last charge, roll a d20. On a 1, the wand dissolves into seawater and is destroyed.