Soul Edge (Ring Blade) is Tira's ultimate weapon in Soulcalibur III, Soulcalibur IV, and Soulcalibur: Broken Destiny. Although, even though this could easily be considered her most powerful and effective weapon, when in use, Tira's health will slowly and gradually decrease. When held in her hands, it adapts its form to best suit her fighting style, becoming a giant, dried snake similar to the Ouroboros symbol. Weirdly, the head and the tail of the snake do not connect.