Mat'Sagh was the god who forged the Ky'yot, a sacred blade, out of the spine of the first knight of Gre'thor. Out of all the D'eethkoras-i temples, the ones built in Mat'Sagh's name were the grandest. They were usually built out of the side of a mountain or volcano, and were surrounded by colossal statues of the god. His followers were known as the greatest blacksmiths of their time, and it is rumored that one of them constructed the first Bat'leth for Kahless.

Mat'Sagh played the part of judge and jury of the dead, and his realm was seen as the arena to the other levels of Gre'thor. He was known for his lack of mercy and once he made his decision on the fate of a dead warrior, it was permanent. The image of Mat'Sagh was that of a tall male carrying a staff. The staff itself was taller than him, and was adorned with a large stone sphere at the crown. With this, he would strike the ground and open one of the gates of Gre'thor. A smaller version of this sphere is used as a judges mallet in Klingon trials today.