Obviously s8 are using their own licence in naming their creatures. Wyvern are smaller cousins of dragons, four limbed, the wings being arms, like bats, which they use for balance when they walk on their hind feet. Also having a barbed,poisonous tail.A la ,the scorched wyvern etc in cs. Cs also has their sea wyvern, and co, which have four little legs, and their wings, thus making them 6 limbed creatures. Like the dragons in cs. Four legs,two wings. Making them also six limbed. Which is a cause of conjecture in fantasy, with some arguing that as most lizards are four limbed, dragons with four legs and wings would be a mutation. So,really, it just comes down to what fantasy you read. My opinion is this is the same as the sea wyvern in our cs realms.I’m tipping a glass sea wyvern, as riverly’s guess at the glass blower seems pretty good to me. But,I could be wrong lol. We’ll find out tomorrow I guess ;-)