Of his life, little is known before his appearance in the Third Age. Scatha's lair was in the southern slopes of the Grey Mountains and he greatly troubled the Dwarves and Men living in the lands North of the Wilderland and had stolen a great deal of their treasure. He was slain by the Éothéod leader Fram, son of Frumgar (an ancestor of Eorl the Young) in the early days of the Éothéod (roughly TA 2000).
After Scatha's demise, peace came to the land save for a dispute over his stolen treasure. In his hoard was found a silver horn, the Horn of Rohan later given to Meriadoc Brandybuck by Éowyn. The Dwarves also claimed the horn (partially justified as the Horn of Rohan was said to be of Dwarven making) but Fram would not give them anything. Instead, Fram sent them a necklace made out of Scatha's teeth. The Dwarves were insulted and may have slain him and took what they wanted.
- It is often misunderstood that Scatha was responsible for the deaths of dwarves in Grey Mountains including Dain I and his second son Frór. However, it is likely incorrect because the incident occurred in TA 2570 to TA 2589, long after Scatha's death in TA 2000.
- If Scatha was born in the First Age, he could be one of two remnants of the dragons of Morgoth that fled into Northeast after the War of Wrath at the end of the First Age, and this means all dragons since the Second Age could have been their offsprings. It is also possible that Scatha participated in the attack on Gondolin and looted the city after its fall. Thus the Elvish swords, Glamdring, Orcrist, and Sting, may have been part of the hoard that Fram now possessed.