From publisher blurb: Among the dead lands within the Broken Circle, ancient texts and devices have led the curiously minded to recreate the ancient art of Transmutation. Equivalent Exchange. Mass-Energy Transfer. Careful planning. These are the concepts to be mastered as you step forth with new found power. Transmuters are adventurers who explore the nature of shapes, forms, and elements in the natural world. Through arrays they are able to modify the world in increasing complexity as they advance in level. This class is compatible with Old-School Essentials and other B/X derivatives.