Beast Quest: Vipero the Snake Man by Adam Blade

Tom stared down into the valley. So this was the Beast! Vipero had the body of a snake, which lay on the sand in red and green coils. But where the snake's head would have been was the muscular torso of a man. Its scaly neck was split into two, and each part carried the flat, wedge-shaped head of a snake. The two heads swayed, hissing angrily, their beady red eyes scanning the desert. Tom suppressed a shudder. Then he spotted the golden leg armor in the middle of Vipero's coils. The swirling decoration on the metal glittered in the sunlight. Though Tom was still a long way from the snake man, he could feel the waves of heat that were thrown out by the Beast's body. It was as if a wall of fire separated them from Vipero.