Storm Seer Lamp (Patreon)

Wondrous item, common

This crystal lantern gives off a faint, refreshing smell that reminds you of being near the ocean. As a bonus action, you can touch the crystal to cause it to glow, casting bright light in a 5- to 20-foot radius and dim light for an additional number of feet equal to the chosen radius. You can alter the radius or cause the light to fade using a bonus action to touch the crystal again. Once the lamp has glowed for a total of 8 hours, it can’t be used again in this way until the next dusk.

In addition, the lamp can detect incoming storms up to 3 hours before they arrive. If an approaching storm would affect the area within 1 mile of the lamp, the crystal's light becomes an eerie, cold gray.

The air was changing. The captain raised his lamp to better see ahead of him. Mist poured over the prow and glazed his skin and mouth. Salt.

The light stirred, flickering for but a moment before changing hue. No longer was the glow from the crystal a warm welcome, but a cold, foreboding gray.

A storm was coming.