Spriggan

Spriggans are gangly Goblin-like Faery-folk that, when left alone, ideally like to dwell around rich barrow mounds and tombs. They are grumpy and crude and easily angered, and once their patience is pushed too far they will grow to Giant size, harnessing their rage to incur the change. Spriggans and Goblins usually are found together, often working for their evil masters. The two Faery races interact and aid each other often when Spriggans choose to socialize, or are forced to by the minions of the Raven King.
The Spriggan Giant Growth lasts as long as it is still alive and angry. Once it calms down, the ugly Fey shrinks back to its normal short, squat size. Due to their size change, Spriggans often are garbed in thrown-together cloth and tattered remains of clothes. They take little care of themselves aside from meeting the basic needs of food and sleep. Their name derives from the Cornish Celtic word Sprygyon (‘Spirit’).