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Appearance: Dark back and light underbelly. She's hard to see when underwater. Like those whales.
Diet: Squid or those big worms that burrow near the shore. Uses her lightning to stun prey. Jaws are more like a beak. Good to grip squishy stuff or crack shells. I think the lightning also helps her see down in the deep water. She does little crackles before she strikes.
Behavior: She's hunting more than she needs. She's also not attacking Antaam unless they get close to her lair. Then she kills them fast. I think she has dragonlings. Must be trying to keep them fed and not look for fights. Only reason a dragon stays that quiet is to protect her kids.