From the game's description:
"The Shapers have the ability to create life, in any form they choose. They can make plants to grow in harsh wastelands, living tools that obey their commands, and powerful monsters to crush any who oppose them. They jealously guard their powers and destroy any who question their will.

Or so they did. Then the revolution came.Your Army

Some of their creations, tired of bondage, rose up. Jealous humans, wanting the powers of the Shapers for themselves, joined them. Now the lands of Terrestia are full of ruins, refugees, and maddened mutant beasts, hunting for prey. There is war. And the Shapers are winning."

You play as an apprentice life crafter, a rebel in the war against the Shapers. Of course, like most Spiderweb games, you have a choice of allegiance. Will you continue to fight against the tyranny of the Shapers, or will you help the Shapers restore order to the world?