A three headed hound named Cerberus.
hades
Hades sent the worst monsters after Thalia as a way to undermine her and the prophecy surrounding her destiny. Thalia was a demigod with significant potential, and by targeting her, Hades aimed to disrupt the balance of power among the Olympian gods and their offspring. The monsters served to test her strength and resilience, reflecting Hades' desire to assert his influence and thwart the plans of the other gods. Ultimately, it was a strategic move to maintain his own dominance in the realm of the Underworld.
Yes... beasts, monsters, and the undead
Hades had his own realm of which he was King, that of the Underworld, and Hades did not often leave it.
Hades himself owns a beast; guard dog named Cerberus. And I am sure The Underworld contains many countless unusual beings.
hades power is to rule the underworld and he has it as his own rule
shadow
The Titans? Like, Kronos (Zeus, Posiedon, and Hades dad)?
Hellhounds, Medusa, and Hades (technically, he is not a monster, he is a god)
A dorky kid who turns out to be the powerful son of Hades
Zeus, Hades, and Poseidon, or the Big Three, swore on the River Styx, to no longer have demigod children, so when Zeus had Thalia, he broke his promise. Hades, angered that he broke his promise, sent horrible monsters after her.
Hades is married to His own neice, and His brother Zeus is also His Father-in-law.