[quote=@Host]
<Snipped quote by ZAVAZggg>

In MR, every dimension has its own (or multiple) time travel systems, often defined by whatever method the time traveler uses to go back in time—that way it can work however you want. If they want to go back in time in every dimension at once, it's a little more convoluted.
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The thing that concerns me is how changes are handled, though I suppose each dimension could be equally hindering or helpful in that regard thanks to the independent systems thing. As for how, I plan on using a ring type time travel device, that can also slow time, by a user manipulating the bands on said ring to set the time either of the trip or the slow. This ring will also leech years from the wearer, though I have yet to decide how specifically that works.