Tiamat

Tiamat is the chaotic evil goddess of chromatic dragons, greed, and envy. She's called the Dragonmother and She of Many Heads. She appears as the a gigantic five-headed dragon, each head the color of a type of chromatic dragon: blue, green, red, black, and white. Her symbol is five dragon heads in a spiral.
The Pentahoard in Shangri-La is a temple devoted to Tiamat.