You don't kill it you put it to sleep with the tune that the muse gives you in Apollo's temple.
The "gnarly monster" is Hydra, in the underwater cave in the realm of Poseidon. The other monster is the three-headed dog Cerberus in the realm of Hades.
Cerberus
To get to Cerberus you have to cross the river Styx.
the cerberus is a 3 headed dog on mythology island on poptropica
In the Underworld-hell- as the guard dog of the god Hades.
Cerberus is in the underworld past the River Styx in the realm of Hades. You will need a reed pipe (flute) and a song from the Temple of the Muses. Playing the short song will lull the monster dog to sleep.
You play the pipe tune and the dog will fall asleep. Then take the whisker.[Its one of the five sacred items.]
Monster Dog was created in 1984.
sorry you cant dont try otherwise they will kill you :(
The duration of Monster Dog is 1.4 hours.
if you mean in mythology island, you dont play a tune for the hydra thats only for the dog you have to jump on their heads if you need help just go to youtube and type in poptropica cheats mythology island
At the river bank, you will find Cerberus, the three-headed dog monster. Tale out the Reed Pipe and play the 6-note song from Euterpe: blue-green-yellow-blue-red-green. He will take a nap and you can get one of his whiskers.