The Tri-ni-set Sky Barrier is an extremely powerful barrier made of Sky Flames created when all three Sky Elements from the Tri-ni-set resonate with each other. The barrier is created when at least two Tri-ni-set elements release an incredibly high output of Flames; the resulting strain put on the elements at this point makes the three elements, the Vongola Ring, Mare Ring and the Arcobaleno Pacifier, start resonating with each other, even if one of the elements is some distance away. If the person carrying one of the elements is some distance away, the barrier is formed around them anyway, and then the barrier begins to float towards the place where the other two elements are. The first sign that the barrier has been activated is a loud gonging sound. It is followed up by the barrier bein