Naruto: Rise of the Hidden World

You become enveloped in a semi-formed version of a Tailed Beast, gaining immense power but losing control. You gain immunity to non-magical damage and resistance to all other damage types except psychic and radiant. Your melee attacks deal an additional 6d6 force damage, and your melee range increases by 5 ft. You can make one additional attack per turn and are considered a Huge creature. At the start of your turn, all creatures within 15 ft must succeed a DC 16 Constitution saving throw or take 3d6 fire damage from the oppressive chakra field. However, at the start of each turn, you must make a DC 18 Wisdom saving throw; failure results in the GM controlling your actions until the start of your next turn, targeting the largest chakra source in range. When this jutsu ends, you take 6d6 psychic damage and must succeed a DC 17 Constitution save or drop to 0 HP.