[Arminius]

Originally Posted by manikus You can't travel back in time with this event. You have to use the spell "Invoke Marty McFly", which is an 8th level mage spell.

Or if you have a Technologist class in your game have him build you a flux capacitor. Only problem is finding a source capable of producing the 1.21 gigawatts of power necessary to break the time-space barrier. In a fantasy realm a magic user could produce a bolt of lightning for you. In a modern setting the party may have to embark on a dangerous quest to steal some plutonium from a group of Libyan terrorists.

If your party are regular time travelers they may already possess knowledge of when and where lightning will strike an old clock tower or something [perhaps they have a list of times and places they googled while visiting the 21st century].

And of course there is the modification they could have had done if they've been to the future - adding an alternative power conversion kit which runs on banana peels and half-empty beer cans.