Titanform

You cause a creature you can see within range to grow to a titanic size for the duration. If the target is unwilling, it can make a Constitution saving throw. On a success, the spell has no effect. On a failure or if the creature is willing, the target's size increases tenfold in all dimensions, and its weight is multiplied by 500. This growth increases its size to gargantuan, regardless of the creature's original size. If there isn't enough room for the target to become ten times its size,  the creature attains the maximum possible size in the space available. Everything it is wearing and carrying disappears as it meld into the creature's body. 

Until the spell ends, the target also gains the following benefits. 

• It has advantage on Strength checks and Strength Saving Throws, and adds 5 to any Strength Check or Saving Throws it makes.
• It gains resistance to all damage types except psychic.
• The target's can choose to do a slam attack with a reach of 15 ft. Each creature in a 5-foot radius of the attack must roll a Dexterity Saving Throw equal to 8+the transformed creature's Strength Score plus proficiency bonus. On a failed save, it takes 4d10 bludgeoning damage. Half as much damage on a success.
• The target's maximum HP increases by a number of points equal to ten times your Constitution modifier.
• The target regenerates HP each round equal to half the caster's level rounded down.
• The target's movement speed doubles.

Special Concentration: This spell does not count as a Concentration spell for the caster and the target. However, if a certain body part takes more than 50 damage in a single round (The DM decides which body part.) The target must roll a Constitution Saving Throw with the DC equal to the caster's spell save DC. On a failed save, the spell ends and the target reverts back to their old size.