Seawolves could either be lesser or greater. Greater seawolves were generally more powerful: they were bigger, stronger, and better swimmers. Lesser seawolves were only faster on land. Otherwise, they were identical.
All seawolves could assume three forms: human form, wolf-human hybrid, or seal-wolf hybrid. At sea, it was fastest at swimming in its seal-wolf form, followed by its human form, then the wolf-human hybrid form. Each form was thickly muscled, but the seal-like form had a thin mane.
Seawolves were savage predators, and lived for the chance at murdering, which they preferred to do in animal form. Otherwise, they were found in human form, often pretending to be sailors or similar professions and committing crimes. They indulged in causing chaos, burglary, and attacking at every opportunity.
As with other werecreatures, a seawolf's lycanthropy was transferred via biting. If the transmission was successful, the infected being would transform into a seawolf on the turn of the next full moon, or within two to five days. The infected creature would feel tainted by evil, much like a twisted version of their former self.
Female seawolves were rarer and, when impregnated, they would give birth to seawolf cubs, which would appear human in the day, and like a seal at night. However, they were always swiftly deserted by their evil parents, with only a one-in-twenty chance of the abandoned seawolves reaching adulthood.
The seawolf diet consisted of sea mammals, fish, and even humans. When in the mood, seawolves would turn into their human forms to visit the local tavern. Here, their activities consisted of much drinking and wenching.
In seal-wolf form, seawolves would attack with deadly bites, which they could also do (but to lesser effect) in hybrid form. Seawolves were dexterous by nature, as well as cunning. They preferred to fight in their primal seal-wolf forms.
Unlike other lycanthropes, when seawolves were slain, they did not revert back to their natural form.
Seawolves formed medium-sized packs, or otherwise traveled on their own or in pairs. Seawolf societies often hunted vessels, which they would board during night time. Once on board, the aquatic lycanthropes would steal treasure, murder the sailors, or both. Otherwise, a few select seawolf spies would integrate themselves into a naval society in their human forms. After this, they would wreak havoc aboard, leading the ships into an ambush of waiting seawolves.
Some seawolf societies kept hidden lairs in coastal environments that were easily accessible from the sea.
In the Sea of Fallen Stars, they were known to be prevalent around the northern part of Serôs. They were also known to occasionally be found in the Great Ice Sea that surrounded the arctic plains of the Hordelands.
- Hrarnok Sharkchum, a lesser seawolf assassin of the Night Masks.
- Asheford Dockscourge, a greater seawolf master hunter from Skullport.
- Jezgar Skentzin, a greater seawolf pirate, who infected an entire crew.
- Dulfan, a seawolf who recruited a large pack, hunting ships and locathah.
- Richard Baker, Joseph D. Carriker, Jr., Jennifer Clarke Wilkes (August 2005). Stormwrack. (Wizards of the Coast), pp. 158–159. ISBN 07-8692-873-5.
- David "Zeb" Cook et al. (1989). Monstrous Compendium Volume One. (TSR, Inc). ISBN 0-8803-8738-6.
- Doug Stewart (June 1993). Monstrous Manual. (TSR, Inc), p. 232. ISBN 1-5607-6619-0.
- Gary Gygax (August 1983). Monster Manual II 1st edition. (TSR, Inc), p. 81. ISBN 0-88038-031-4.
- Steven E. Schend (1999). Sea of Fallen Stars. (TSR, Inc), p. 44. ISBN 0-7869-1393-2.
- David Cook (1990). The Horde (Volume II). (TSR, Inc), p. 128. ISBN 978-0880388689.
- Eric L. Boyd (2006-05-03). Environs of Waterdeep (Zipped PDF). Wizards of the Coast. p. 11. Archived from the original on 2016-08-16. Retrieved on 2009-10-07.
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