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Big lizard!? How dare she! He was--... Well, what was a dragon? He knew it was a big, fearsome thing with scales and a serpentine body and he knew they breathed fire, but beyond that? ...He'd have to bluff!
"Aquarian is dragon! I am dragon! HUGE-BIGGER-THAN-THIS-CAVE, long-and-claws, BIG TEETH!" he roared (squeaked). "Dragons make FIRE!" he added.
To demonstrate, he focused on calling his magic, for a moment. Heat bubbled up within him and coursed up his throat, spewing out into nearby rock in a sizzling, hissing, bubbling pile of bile. It wasn't fire, but even so, the heat it gave off could be felt from a few feet away.
Then--in case Eve hadn't heard him say it the first few times--he roared (squeaked): "I AM DRAGON!"
Then he paused, eyeing Eve. "...I'm going crystal now." And then he turned, shuffling quickly off toward the Spire, tail dragging with quiet swishes, to and fro, behind him.