Sin-ak is a Rikker (mage) type goblin. He was first encountered in the Confusing mists while chasing a Sprite that had escaped their captivity.[1]
Goblins can have subclasses that determine their specific powers. Most are a common variant however that are broken into different stations reflective of their physical and magical characteristics. Prolific breeders and woefully aggressive, goblins are a plague on other races.
Goblins of the Roller station are normally gifted in magical arts. Rikkers often serve as administrators and councilors for goblin leaders. Many offspring of various races have been sacrificed for their experiments. Goblin Rikkers receive three points to distribute per level, and each level gives +1 to Intelligence and +1 to Wisdom.
After he was killed, Richter received a Memory. Reliving the memory showed that he was an extremely cruel goblin. He was ordered to retrieve the escaped Sprite by Heqht-jo.[2]