The term sea witch, swamp witch, lake witch and the myriad of other diversions of the source are a largely colloquial term for an number of aquatic magic wielders, a completely ambiguous term that holds no racial identity. One of the unifying elements are the innate magical abilities of these aquatic beings and use of magical objects to intensify said abilities.
A Hippocampus horn is one such a prized tool amongst sea witches, while a unicorn horn is the sought after tool of choice for the bog, swamp and related "witches". Such an object has many magical abilities and purposes, with one being the ability to breach the surface of their underwater realms and fly.
A Swamp Sod, the solitary and less aggressive member of the “sea witch” term, will regularly travel from swamp to swamp as their homes dry up. While typically not a collector of magical objects, here a Sod stumbled upon a long since dead skull of a once shackled unicorn, and is making its maiden flight.
A Golden crab adorns it’s head, a powerful ritual item and trusted familiar, whispering incantations of tempest proportions. These trusted familiars are commonly mistaken for will-o-the-wisps