Something like Trial and Error

While Aresenn went off to find an instrument to use as a transfer device, Sephiran stayed next to the steaming rock. He watched the crimson boy poke around at the remnants of a nearby tree, before biting at it to rip off a blackened branch. His gaze shifted toward the small crack in the rock, narrowing in on the small streak of magma that was seeping from an opening. He didn’t have to get closer to it to know that’s where the heat was coming from, which meant standing so close was dangerous. But it was a risk he was fine with taking.

With a stoic expression, he watched Aresenn dip the stick in the magma, using it to transfer drops of the bubbling liquid into the band they had made. It started to sizzle and steam, but quickly dried to create a stronger bond between the teeth and the crocodile skin. More steam spouted up when Aresenn doused it with water, likely trying to keep it from catching on fire. Which worked perfectly.

Then he copied what Aresenn had done, first harvesting a stick before dipping it into the magma and placing drops on his own collar. He used the weird, water-holding thing to keep it from igniting, which cooled the magma and created the bond. After it dried out, he leaned down to inspect it. It wasn’t the best-looking tool, but it would serve its purpose nonetheless.

"Speech"