Ddraig Goch is Sir Lancelot's ultimate sword in Sonic and the Black Knight. It looks somewhat like Shadow's head, with the utmost spike being the blade. When Lancelot starts a stage with Ddriag Goch equipped, his Soul Gauge will be instantly filled. While using it, Sir Lancelot can use Chaos Spear just by swinging his sword, and Chaos Blast when using Soul Surge. It is obtained with 2 Katanas, 2 Orichalcum, 2 Dragon Eye Stones, and 2 Medals of Lancelot.
The Sword itself has a black-colored blade with a bright red edge, with two smaller curved spikes to resemble Lancelot's head. It has an intricate design on the edge, and a blackish-brown handle.