Walarkus

Walarkus is an adult bronze dragon of Blightshore. It has not yet appeared on Critical Role.

Walarkus was once a noble metallic dragon, as many of its kind, but the magic of Blightshore corrupted it, turning it into a dangerous greedy creature that attacks ships to take treasures to its undersea trove.

Abilities
Assuming Walarkus is typical of adult bronze dragons, it is immune to lightning damage and has a 40-foot swimming speed. It would have two breath weapons, one of which pushed creatures away within a conic area; the other would cause lightning damage in a long line.

In its lair, Walarkus would be able to create fogs (or an underwater equivalent) and produce thunderclaps from points within its sight. It would also be able to control water currents and summon spectral dolphins and salt crystals.

The region around the lair might be under the effects of the Control Weather spell, and underwater plants within 6 miles of the dragon's lair might take on dazzlingly brilliant hues. Walarkus would also be able to set illusory sounds, like soft music or strange echoes that can be heard in various parts of the lair.