A matrix Mechanic learns to manipulate matter and energy using his laran and matrix stone, and to make and use tools that focus and augment laran. In "The Bloody Sun" Jeff Kerwin, just beginning his training as a mechanic, notices that the hinge on a door is beginning to rust, and, taking out his matrix, he stops it. Greater skill is required to perform tasks such as refining metals or causing rain to fight a forest fire. Despite all the things that can be done with "laran", it is not wise to use it for everything; in "The Bloody Sun" Rannirl, a Level2 Mechanic, repairs a leaky roof at Arilinn by climbing onto the roof with materials and tools.