High Quality Content by WIKIPEDIA articles! Magic in the Malazan Book of the Fallen, a high fantasy series by Steven Erikson, involves tapping power from inside the mage, taking power from spirits, or most commonly using the power of a Warren or Hold. The effects created varies depending on where the magic is taken from, how it is combined, and the intent of the mage. Warrens are themselves complete realms or worlds containing sentient and non-sentient creatures, geography and a ruling creature, usually a god. The power of warrens are theorized to come from dragons, each of whom have an aspect the same as the warren. Most races have a racial Warren that exhibits particular effects or properties; humans generally tap Warrens based on an innate preference, that produce limited or specific effects. The books have stated that Warrens are best described as closed doors in the mage`s mind. Accessing the power behind it requires careful, and deliberate opening to unleash and shape the power within. Controlling an open Warren is a draining process, and to open the door too far is to invite madness, physical harm, or death upon the mage. Racial Warrens are Elder, unavailable to humans in most cases, and significantly more powerful, in addition to being immune to the magic-deadening effects of otataral.