* They're not gods: Monsters in the Percy Jackson universe are not gods, but rather creatures born from the primordial forces of the world or created by powerful beings.
* They're mortal: While they may possess superhuman strength, speed, and abilities, monsters are ultimately mortal. They can be killed by humans, especially demigods who possess divine powers.
* They're vulnerable: Each type of monster has specific weaknesses, like a Medusa's gaze, a Minotaur's rage, or a Fury's anger. Knowing these weaknesses allows demigods to defeat them.
* They're controlled by the forces of evil: Monsters often serve the forces of evil, like Kronos or Hades, who are eager to see them die in the service of their goals.
Essentially, monsters are not invincible. They are powerful but still vulnerable creatures who can be defeated by those with enough skill and knowledge.