Ocean strider

Ocean striders were huge aquatic fey that, as their name suggested, waded through and could even walk on top of large waters. They claimed particular stretches of water, appointing themselves as the protectors of those regions.

Description
Ocean striders looked like something of a cross between elves and killer whales, possessing the humanoid form and face of an elf, and the rubbery black-and-white patterned skin, sharp teeth, and stubby fluked tail of an orca.

Abilities
Having both gills and lungs, ocean striders could breathe both above and underwater.

Ocean striders could cast acid fog, cone of cold, control water, elemental swarm (water only), fog cloud, horrid wilting, ice storm, obscuring mist, and summon nature's ally IX (water or aquatic only). Their ability to walk over water functioned as if they were under the constant effect of a water walk spell.

Personality
Although very protective of their territories, ocean striders made a point of warning intruders away before attacking. With promises not to break their rules (which prohibited overfishing and polluting the waters), seafarers could occasionally even negotiate entry into an ocean strider's domain, though the fey would usually continue keeping a close eye on those passing through.

Combat
When an intruder into their territory waived the ocean strider's established rules or even ignored the creature, it would generally open attack. They would typically attack offending ships by ramming directly into them.

Ocean striders typically carried masterfully crafted falchions and wore mithral scale mail.

Notable
Local legend dictated that an ocean strider acted as the Dolphingulf's guardian, though there was no empirical evidence of its existence.