Zetalo is the venom realm, homeland to the snakes. It's a large imperial city. Guarded by many imperial Medusa snakes.
Zetalo is a big green platform that forms a circle. Four bridges lead to the middle and in the middle lies an elevator. And behind those bridges are portals to Zetalo, which is guarded by two imperial Medusa snakes all the time.
If you go down the elevator, there will be lined guards, armed with spears and imperial Medusa armor. They all line up to a door and there is Medusa's throne.