Seven Kingdoms: Seowyn's Crossing
The “Old Ones” is the term given by the people of Seowyn’s Crossing to a race that may have lived in their region of Aldorath before them. Although they have left few visual clues, the Old Ones appear to have been ogre or troll height humanoids with six arms. Their works tend to be largely simple, but they also left behind weapons and structures that show great craftsmanship. The so-called Warforged may be creations of the Old Ones, but they have no memories of their own creation.
It has been surmised that the lack of almost any visual image of the Old Ones is due to some other race deliberately wiping out any traces of them. The largest preponderance of Old One architecture can be found in the hills called the Broken Barrows.
In 1081 SKR, the Fire Wasps discovered a small section of Old One ruins under the city of Shellcliff in the Holds of the Sea Barons. A huge statue of the Tarrasque was located here, and an inscription on its base have revealed that the Old Ones created the Tarrasque as a weapon to battle both the Gods and the Primordials.