I see a lot of GMs simply ignoring this Law.
Or enforcing it harshly:
-
Warden Traps tipped off by the
Gatekeeper- The PCs age very rapidly when in an Alternate Time Zone: 1 hour there = 1 year older.
- PCs trapped in Alternate Timeline - Permanently.
- PCs trapped in Time Loop
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For those that have read
DC's
Crisis On Infinite Earths - try and imagine if there had not been a
Monitor to tell everyone what the Threat was, and which "Earth" any given Hero was from?
Some
Heroes - Like
Superman - would not have cared, and would have worked side-by-side with each other to try and figure out how to end the threat.
Some would simply ignore and avoid the other alternate selves, unless absolutely needed - Like
Batman.
Others would have most likely ended up fighting each other, if not shown a greater threat immediately - I could name names, but that list is a little long....
And consider this, all the
DC Villians would have still worked together to get ride of all the
Heroes, and
then fought each other as to who got to be
The Villian King of the Mountain.
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Properly handled, and with the help of the Players, this could be closer to the
Back To The Future movies.
It is difficult to pull off - especially since the GM has to pre-plan for as many
Alternate Outcomes as possible
in advance. The GM also needs to have ways for the Players to figure out how their Characters are to fix what went wrong, then go back and try and fix it, while dealing with Old Baddies (and maybe New Baddies and/or Time Traveling Baddies) and at the same time
always avoiding their Past Selves!
And in the meantime, their Character is "M.I.A." in the "Current Timeline" - and the Wardens are going to be very interested in where you have been while you were "away"....