Serpent Mage is a fantasy novel by American writers Margaret Weis and Tracy Hickman, the fourth book in The Death Gate Cycle series.

After the four worlds Alfred has at last found his people on Chelstra, the realm of sea.

But his travels have taught him to be cautious... and Alfred soon realizes his caution is justified, even among his own kind.

Now the companions have arrived in a land where humans, elves, and dwarves have learned to live in peace.

Unaware of an even greater threat to all the realms, it is Sartan and Patryn who will disrupt this alliance of the lesser races in their struggle to gain control of all four worlds.