Is tiamat a name, or a species? IIRC tiamat is just the name mogar gave him
As for Lith, he wanted to be capable of using the pocket dimension and Origin Flames to ensure his victory no matter what cards Quaron had in his sleeve. In theory, there was no way that a fake human mage could beat an Awakened Tiamat in human form, but there was too much on the line to risk underestimating his opponent.
On top of that, Zogar Vastor wasn't a forgiving man. As the Master, he had put a bounty on the heads of the survivors so big that no matter where they went, they had no allies.
"Respect my rules and you won't even notice our presence. My rules are simple. One: do as Linjos says. Two: never harm a cub, human or otherwise, in my presence." One of the reasons the Scorpicore had decided to help the academy was that, having lost many of her offspring before turning into a Scorpicore, Scarlett had a soft spot for children.
- "Quylla would probably follow him even if he revealed to be an undead or a shape-shifting monster." Yurial thought. "Friya will simply come along. Those two are so glued together that I wouldn't be surprised even if she accepted to take part in a threesome.