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Message: <blockquote data-quote="Cleon" data-source="post: 5747544" data-attributes="member: 57383">I think the advancement should go up to Gargantuan, since the largest Pliosaurs were 50+ feet.They could go like this:Generic Large Pliosaur 10-12 feet long (5 Hit Dice)Generic Huge Pliosaur 20-25 feet long (10 Hit Dice)Generic Gargantuan Pliosaur 40-50 feet long (20 Hit Dice)That would fit with the SRD Elasmosaurus which is 10 HD and Huge, and  reaches Gargantuan at 21+ HD.Generic Pliosaur #1: 5-9 HD (Large); 10-20 HD (Huge); 21-30 HD (Gargantuan)Contrariwise, if they are based on "Crocodilian" stats we should also  consider the SRD Giant Crocodile, which is 7 HD and Huge. Also, we've  also got a big Pliosaur conversion in Enworld, the Kronosaurus, which is Gargantuan but only has 17 Hit Dice.That suggests it may have a lower HD range, maybe something like:Generic Pliosaur #2: 5-8 HD (Large); 9-16 HD (Huge); 17-25 HD (Gargantuan)Liopleurodon has official stats in Dragon #318, It is a Colossal 80+  foot creature with 38 Hit Dice, which is much larger than known fossil  evidence supports.If we expand our Pliosaurs HD and size values  to Colossal, you'll see that a 38 HD Liopleurodon is a better fit to the  "lower HD" Pliosaur #2:Expanded Generic Pliosaur #1: 5-9 HD (Large); 10-20 HD (Huge); 21-41? HD (Gargantuan); 42-75? HD (Colossal)Expanded Generic Pliosaur #2: 5-8 HD (Large); 9-16 HD (Huge); 17-32 HD (Gargantuan); 33-75 HD (Colossal)</blockquote>