Breathing Bubble

A Breathing Bubble is a magic helmet that fills with breathable air.

Description
If the item does not have a lot of information for both Appearance and Properties, the sub-headers can be deleted and everything combined into a single section.

Appearance
Breathing Bubbles resemble glass bowls with a steel cage wrapped around it. The surface is slightly tacky.

Properties
A Breathing Bubble contains 1 hour of breathable air, which a creature can benefit from only while wearing it as a helmet. The bubble regains expended air daily at dawn.

Tide of Retribution
The Port Damali blacksmith Hektor received several Breathing Bubbles from inventors in Port Zoon. If the adventuring party accompanying Three Earrings on the Wavechaser chose Port Damali as their port of call, Three Earrings would send them to Hektor's smithy for supplies, along with a letter to be given to Hektor with instructions not to open it. The letter extorts Hektor to hand over his Breathing Bubbles to the party, saying that if he does the Revelry will leave his next shipment alone. Hektor complied to this threat, giving one Breathing Bubble to each member of the party at no charge.

Call of the Netherdeep
The Allegiance of Allsight's base camp in the ruins of Cael Morrow has a pair of Breathing Bubbles their personnel and allies use to explore the underwater ruins.