Major Ring of Primal Power (5e Equipment)
From D&D Wiki
Ring, very rare (requires attunement)
A bizarre ring imbued with the ancient power of primal might. It glows a faint silver and allows the user to take on an alternate form. Cannot be worn with the Minor Ring of Primal Power or Unyielding Ring of Primal Power.
Near-Sail. A sail protrudes from your spine that increase your movement speed by 5 feet. You can unleash a frightening roar as an action. All enemies within a 30 foot range of you must succeed a DC 14 Wisdom saving throw or become frightened for 1 minute. They may repeat the saving throw at the end of their turn. You regain use of this effect after you finish a short or long rest.