As the spawn of the elder gods:
"The burdens of the great rest on our shoulders. Our lives continue only to ease those of our creators. We are but humble vassals, and our fealty is sworn to the will of the Circle." -Oath of the Titans.
She is tasked with the protection of the Sea Orb, one of four legendary treasures. She is capable of ripping apart even the most powerful of opponents, and will do so if they so much as think of trying to take the treasure she is sworn to protect.
The elder gods:
"You are just a hollow shell with the capability to think for yourself. What you believe to be your power is only what we have allowed you to have. You are no more dangerous to us as a newborn babe is to a predator. This is cold truth and naught shall remain of those who wish to defy it!" -An answer.
Also known as "the Makers". They are the original beings, which now only exist to keep the order. Resistance is futile against the will of the elder gods, all power in the possession of other beings is just a gift from them which can and will be taken away should their creations become too rowdy. All existence is from their own actions, which can also be taken away just as easily. Worlds within worlds. Alternate universes. All is but a plaything for them in the end. The power of a Maker is second to none. Attempts to challenge the power of a Maker will be met with fatal repercussions.
Treasures of the gods:
"Now speak your wish. Life at the cost of everything, or everything at the cost of life. -The hollow choice.
Special trinkets forged by the Makers themselves. When all gathered together, they can bring about the end to the world they are in or quell evil. They are all guarded by special beings created by the Makers. These beings are known as "Titans". The jewels are meant as a fail safe for worlds. Four of them exist in all worlds, and if they are all brought together, the person(s) responsible will have a decision. They can sacrifice their own world for the gift of real power, or they can use the jewels to banish the evil of the world all at once at the cost of their own lives. This, again, is also nothing more than a game for the Makers. Entertainment for the creators of all existence.
Things to know:
Thylissa is a Kraken, she will have dominion over all other sea creatures.
Thylissa has a resistance to both might and magic. Both might and magic, when used against her, lose about 50% of their power.