Melkor:
I think Edena has ruled out chronomancy for this IR. This is what he wrote on the back up boards. (I do think your idea is brilliant, however.)
TO KABOOM AND EVERYONE ELSE
You can go back in time, and conduct 11th level feats, yes ...
There is a minor problem with that.
Just one minor little problem.
If YOUR Power is going back in time to gain more time to accomplish 11th level feats ...
Then MY Powers (the Black Brotherhood, Acererak) are going back in time to accomplish 11th level feats ...
And, of course, every other Power in the IR will go back in time, in order to gain all those weeks, months, and years (and decades, and centuries, and millennia) to work on 11th level projects.
Of course, if YOUR Power, Kaboom, goes back in time to do this, MY Power - Acererak, goes back to PRECISELY the point in time where you went back, and IMMEDIATELY Attacks your Power.
Acererak is not going to allow your Power endless time to work on 11th level projects! Oh no, not when he can destroy you and have endless amounts of time for HIS projects!
Of course, Melkor will go back in time too.
And, then, other Powers will go back in time to stop him.
Then, other Powers will go back in time to stop THEM.
In other words, Day 2 occurs normally.
I am not sure WHEN Day 2 occurs - it could be in the Now, or it could be 100 years back in time, or it could be 1,000,000 years back in time, but Day 2 DOES occur - in the standard way.
- - -
I can take this a step further yet.
Time travel is 9th level magic.
The name of the spell is Time Conduit, 9th level, from the sourcebooks.
Rajaat, realizing he is fried in the Now, can use his 9th level spell, Time Conduit, to travel back to when his Power still had 11th level magic.
He can then warn HIMSELF that this happens to HIM in the near future.
Then, the other Rajaat can shift his entire Power backward in time, to the Blue Age of Athas, and spend all the years they want on 11th level research.
You go back in time to stop them, right?
Well, Rajaat, knowing you are coming - after all, in the Now he READ THIS in his own histories, that you CAME, can take his Power further back in time, thus avoiding you.
Then, of course, you go further back in time to catch him, but he read that too, so he goes yet further back - or forward! - in time, to avoid you.
Of course, all this leapfrogging back and forth in time starts generating Alternate Realities by the dozens.
Your Powers get sucked into these Alternate Realities, and thus can never come back into the Now, for for them there is no Future as they remember it ... the Future has not been made yet.
Remember how Tasslehoff Burrfoot got the Device of Time Travelling?
They don't allow kender to handle even minor spell components, much less spellbooks and 1st level spells, much less 9th level spells, much less great magical items, much less artifacts and relics, much less time travelling devices - unless it's in a book.
What is being proposed here, would be like giving several thousand kender those time travelling devices, along with Carte Blanche (remember my article??) to use them in ANY way they wanted, with no interference from the deities, or anything else.
In other words, the IR will explode into a Chronomantic Version of Red Goo, which will eat the DM for dinner, and the players for dessert.
(For that matter, who is to say Melkor didn't go back in time with Red Goo, and turn all the worlds into Red Goo Balls, in which case the whole IR never happened, and ...)
- - -
RULING:
Your Power CAN state it is going back in time, to gain time to work on 11th level projects.
When your Power goes, all other Powers in the IR capable of 11th level magic also go, and arrive at your precise time (they would, logically, do this.)
Day 2 occurs normally (it may occur a million years ago, but it still occurs normally.)
History is not altered.
Day 3 occurs normally, and Day 4 occurs normally, etc., regardless of who shifts where in time.
If several Powers declare they are travelling to different times in the past (such as Melkor goes 1,000 years back in time, Kaboom 100 years, and the Black Brotherhood 10,000 years) ...
I am ruling that your 11th level Powers can strike forward and backwards in time.
In other words, you declare Attacks and Defenses normally - you are still attacking the enemy Power normally. You are simply sending Attacks forward or backward in time, to hit the enemy Power wherever it happens to be in time.
- - -
In other words, you cannot gain extra time to work on 11th level projects by going back in time.
You cannot gain any special advantage by going back in time.
You cannot alter history by going back in time.
You CAN carry on an interstellar, chronomatic war, in which you carry on 11th Level Dueling, and Coup de Graces.
Instead of the war occurring in the normal 3 dimensions, it occurs in all 4 dimensions (and, I suppose, it could even occur in dimension 5, cyberspace.)
However, the results are the same.
There are no changes in the rules whatsoever, and nobody gains any particular advantage from time travel.
It will be an interesting aside - Melkor, instead of Dueling with William in the here and now, will be dueling with him from 1,000 years ago, while William is 100 years ago, but ... the rules will not change.
Attacks, Defenses, Held Actions, Days, will all occur as per the standard rules.
Sorry folks, but I will not allow the IR to turn into a Chronomatic Red Goo Monster, which eats me for dinner.
I'm too thin to be edible and tasty anyways.
Edena_of_Neith