[I learned about this creature from @iguanodont, and my take is pretty much a direct conversion of their interpretation of it as a protocetid. There’s a Tlingit story where a man kills a gonakadet and wears its skin, turning into one every night and feeding his tribe in secret. At least, that’s the one version of the story that’s common online.]
Gonakadet This
creature looks something like a hybrid of wolf and whale, with a pointed snout,
clawed fore-flippers and a mane of shaggy hair at its nape.
Also known as the seawolf or the
wasgo, the gonakadet is a whale-like predator that maintains some ties to the
land. They usually hunt solitarily, feeding on fish and seals in cold coastal
waters. When prey is scarce in the ocean, they can haul themselves onto land
and look for food in lakes and rivers. They rarely hunt on land, but may chase
seals (or fishing boats) onto the beach in pursuit of a meal. Males are larger
than females and have short horn-like appendages—they use these to butt heads
with rivals in competition for mates. Females tend to give birth and raise
their young in freshwater to avoid predators such as sharks and killer whales.
Males typically mate with multiple females, but visit all their mates and
provision them with regurgitated food so they can defend their calves.
Gonakadet
as Animal Companions Starting Statistics:
Size Medium; Speed 15 ft., swim40 ft..; AC +2 natural armor; Attack bite (1d6), 2 claws (1d2); Ability Scores Str 12, Dex 18, Con 10,
Int 2, Wis 13, Cha 7; Special Qualities
superior low-light vision, scent, weak claws
7th-Level
Advancement: Size Large AC +3 natural armor; Attack bite
(1d8), 2 claws (1d4); Ability Scores Str
+8, Dex -2, Con +4; Special Qualities grab, powerful blows (bite)
Gonakadets are native to the coasts of Senksen, where they compete with polar bears for seal prey. They are sometimes taken as animal companions by druids of a nautical leaning, being easier to tame but rarer to find than polar bears.
Shores of Swords 