Threefold Return

The recipient of this spell becomes temporarily immune to Slashing, Bludgeoning, and Piercing damage of all kinds. Any such attack has all of its kinetic energy absorbed on contact. This energy (the damage from the attack) is stored within the recipient. For the duration of the spell all damage from Slashing, Bludgeoning, or Piercing attacks is stored ready to be released.

At any point while the spell is active the recipient may choose to end the effect by releasing the stored energy into a melee attack. The stored damage is released, and multiplied by three, in an explosive discharge into the subject of a successful attack. This attack cannot be used against inanimate objects, but can be used against constructs, automatons and animated physical material that could be considered an enemy. 

If the recipient of the spell does not make a successful attack to release the stored energy once they have chosen to end the spell effect the accumulated damage is multiplied by three and inflicted in one burst on the spell recipient instead.

The spell can be cast on an unwilling recipient, a Constitution save against the caster's spell difficulty is required to resist.

This spell has no effect on any energy based attacks such as force, acid, fire, cold, etc.