What secret weapon did bellerophon use to defeat the chimaera?

Bellerophon defeated the Chimera by using a combination of his skill and the aid of the winged horse Pegasus. He rode Pegasus into the air to avoid the Chimera's fiery breath and launched arrows at the creature from a safe distance. Additionally, he utilized a lead-tipped arrow, which melted upon contact with the Chimera's flames, ultimately allowing him to strike the beast fatally. This strategic advantage and his divine companion were key to his victory.