In Manx folklore, the Arkan Sonney is a fae-being that has the appearance of a white wild pig or boar with glowing red eyes. It is said that catching an Arkan Sonney alive will bring good luck to the person that caught it.
In Eira the Arkan Sonney is a creature of the Night Lands that escaped into the mortal realms during the war between the Au-Sidhe and the Un-Sidhe. With no natural predators, and a natural ability to mate with mortal pigs and boars, the Arkan Sonney soon spread across the entirety of Eira.
The Arken Sonney is tempered much like the Wild Boar but much more intelligent and cunning and with some powers native of the fae realms. It is said (although never seen) that some of the older Arken Sonney can speak in both the fae and mortal tongues.
King Eld, known as the “Hunter of the North” to his people looked with dismay as the tracks of the boar he had spent most of the day tracking vanished into the frozen bogs. Holding up his hand in a lose fist to signal to his men to hold, he moved forward, pole-arm at the ready. A noise cought him by surprise from the south, he turned – too late – to see the menacing red eyes of the creature that only looked like a boar. “Run!” He screamed to his men. “RUN!”
Hit Dice: 4+4
Armor Class: 5 
Attacks: Gore (3d4)
Saving Throw: 14
Special: Continues attacking 2 rounds after being “killed”, Can grow larger (Medium to Giant)
Challenge Level/XP: 5/240
Much like their mortal brethren the wild boar, the Arkan Sonney will continue to attack anyone adjacent to it for two-rounds after it reaches zero hit points. Due to its fae heritage the Arkan Sonney can, at-will, increase its size from medium to Giant for up to four rounds, While in its increased size, the Arkan Sonney does an additional +2 damage.