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In some myths, the final defeat of the Titans was the end of Zeus ascent to the position of absolute ruler of the world. However, he was to face one more challenge in the form of a huge monster. Typhoon was the son of Hades and Gaia, the goddess of the earth. She was deeply angered by Zeus and his treatment of the Titans, who were her children, after all. She decided to turn her monstrous son Typhoon against him, according to the didactic poet Hesiod in his Theogony .<ref>Hesiod, Theogony, 490</ref>.  He is often seen as the personification of the volcanic forces in Greek mythology. Typhoon who was a serpent-like monster, who had countless heads which could spit poison challenged Zeus for the rule of the world. Hesiod describes the world and the heavens being shaken by the battle between the two. Zeus is portrayed as throwing his thunder and lightning bolts at the huge serpent and Typhoon spat poison and shot flames at the ruler of Olympus.  In one account the other gods were so afraid of Typhoon that they transformed themselves into animals to hide from his wrath. However, all the myths agree that Zeus overcame the creature known as the enemy of the gods. In most of the sources, the King of the Gods cast the huge serpentine monster into Tartarus with his other enemies. However, other stories state that Zeus entombed him under Mount Vesuvius and that the flames that occasionally shot from the volcano are from Typhoon .<ref>Graves, p. 113</ref>.