B6C14 Molten Armour

A great wall, easily twenty or thirty metres tall, had sprung up under it, connecting down from Phoenix to the ground like some kind of cylindrical tower that ringed the arena. It cut us off from getting in, preventing us from even seeing what was going on. Everyone in the stands was safe assuming they weren't knocked into it, but the Kings of Vale and Mistral were trapped inside, essentially locked away in another world for all we could hope to do.

"Weiss?" I asked.

The Mage responded not with words but with ice and water instead, blasting a huge amount of it at the wall of flame. The ice struck and melted instantly, joining the water in casting great gouts of steam into the air. It hissed and burned, evaporating almost immediately. The wall did not so much as flicker, let alone weaken.

She tried again, this time creating a tunnel of ice that she thrust into it, hoping to give us at least a few seconds with which we could get inside. But that, too, failed to get past, collapsing in on itself the moment it touched the unnatural fire.

[...]

I knelt, picked up a loose pebble and tossed it at the wall. It fizzled and cracked instantly, exploding into tiny shards of rock and dust. It hadn't even passed through, instead being knocked back at us by the force.

[...]

Before they could ask how or why, I turned and stepped into the inferno. I took a breath a second before I did and held it, running a gauntlet down over my faceplate to once more cover my eyes and mouth.

[...]

It felt like an eternity but couldn't have been. It was more akin to thirty seconds, but my lungs burned from lack of air and I wanted nothing more than to tear the helmet from my head. To do so, however, would be to incinerate myself immediately.