You assume an immutable form. You become immune to other transmutation spells or magical effects that would alter your form. If you don't move during your turn, you gain advantage on Strength or Constitution saving throws made before the start of your next turn, and cannot be moved or knocked down against your will. While the spell is active, as a reaction to taking bludgeoning, piercing, or slashing damage you can gain resistance to that damage type (Including the triggering damage) until the end of your next turn, but your movement speed becomes zero until the end of your next turn.