by Eddie Patin
Focus Key. An item unique to a particular universe (or set of universes) that Jason can use to focus on opening a rift to a particular point in space-time. The more unique the focus key is (i.e. to a single universe instead of several), the more easily Jason can open a predictable rift. Jason instinctively tries to use American cash as a focus key when trying to get home, which results in him jumping into random other universes that also have the same cash. Focus keys are only alluded to in Book One. In Book 2, Jason learns a lot more about focus keys and begins carrying them around, including his 'Home Key'—a focus key blank made into a necklace around his neck that can bring him home to his garage in an emergency.
Focus Key 'Blanks'. Available for sale at the Market, these are small metallic rods about the size of a pack of stick chewing gum with a hole bored through on each side. They're designed to be broken in half to act as semi-permanent or temporary focus keys. One half leads to the other. For example, Jason constructed a 'Home Key', which is a Focus Key Blank broken in half; one half is attached to a loop of paracord and worn as a necklace around Jason's neck, while the other half is in a locked tool cabinet drawer back in his garage on universe 934. He can use that blank around his neck to rift home. More uses of these blanks will come up in future books.
Infinity Crystal. A piezoelectric crystal from one world or another capable of producing more power than is required to activate it, capable of creating a surplus of energy. The infinity crystals from the Wilderlands are unique and act as a focus key to the wyvern's cavern in the u312 equivalent area of Jason's home on u934.
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