An Irish myth that, like so many, has a range of idiosyncratic interpretations. I've gone with the more distinctly ottery version, rather than something akin go a giant dog/otter.
Dobhar-chú
by Cab Davidson
| Stat | Dobhar-chú* |
| AC: | 2 |
| HD: | 7* |
| Move (land): | 150’(50’) |
| Move (swimming): | 180’(60’) |
| Attack: | 2 claws+ 1 bite |
| Damage: | 1d8/1d8/2d8 |
| No. Appearing: | 1 (1d2) |
| Save As: | F4 |
| Morale: | 10 |
| Treasure Type: | E |
| Intelligence: | 7 |
| Alignment: | Neutral |
| XP Value: | 850 |
Dobhar-chú are the legendary kings of the otters. They stand around 4’ tall at the shoulder, and are anything up to 15’ long, and built in a far more muscular, massive way than normal otters. They are not innately hostile to humans and demi-humans, but they frequently find themselves in conflict with them if mustelids (otters, weasels, badgers, ferrets etc.) and their habitats are threatened with human encroachment.
Their thick fur coats seem to protect them from some forces, meaning they can only be struck with magic weapons, and are immine to 1st level spells. Their pelts are highly valued, and can be fashioned into high quality leather armour that is easier to magically work with than most other leathers (+5% chance of successfully enchanting). Any creature waring armour made thereof suffers a -4 on reaction rolls with all mustelids.
All mustelids are willing to obey them, including giant weasels and giant ferrets, and any within 360’ will hasten to their assistance if called. Dobhar-chú are intelligent, and can be bargained with, but they are uncompromising in defence of these creatures, which they see as their subjects.