User blog comment:Ash9876/Ashy's Reviews - Fairy Tail 497: The Winter Mage/@comment-3045936-20160810041616

Invel's Ice Sleep of incasing the heart reminds of my reverse idea for Cobra's Sound Magic I call Silent World. Is that it can "seal" the sound of the world and one's soul. It can even seal the "sound" of one's thoughts to act like Mayuri's Thought Stopping Drug that induces mindlessness.

Aside from that Invel seem much stronger than I thought. I knew he was strong being in the Spriggan, but damn I am surprised that Hiro used him good. Like an Ice Devil Slayer getting affected by as of now non-slayer Ice Magic, that takes power. :)