I can easily see and agree with the opinion that formations that can't
or don't want to move onto the board just don't activate. They don't need a 0cm move or a marshall or to go on overwatch in the webway or in their tomb. They just don't go. The Eldar can't be expected to move every formation out because it is just not a viable idea tactically. If you have two Storm Serpents and the Eldar have three formations off board, you can't expect three formations to move out of the available portals. It is silly and I think any reasonable person can see this if they actually play Epic. I don't think this is in debate at this point so, moving on...
Teleporters can't be denied the ability to teleport unless they are broken, so everything from Monoliths to Terminators are in the clear. Moving on...
The last point is what needs to be hammered out. There is an existing rule in place from the core rules that says a formation that fails its activation may HOLD which consists of three separate parts.
Shoot: I believe you need to have a valid target so this is out.
Move: I don't think anybody would fight that a formation off board could simply move out of the portal and onto the board. If we are consistent with the decision above that it is a player's choice to move onto the board or not, that choice should still extend to the player here. To move, or not to move- that is the question. It is wrong to force (take an Eldar Guardian formation with no armor) the player to move his forces out into certain doom and is not in the spirit of Epic. So if a player cannot move, cannot shoot, he is left with...
Regroup: this is all that's left. Regrouping is simply a formation that is reorganizing itself -forming up- so that they are ready to fight better after coming under fire (or failing to activate - equipment failure!

). If you
can't do this off board, where
can you do this?
It is consistent logically, realistically, and mechanically.
If it unduly improves the Necrons then the
Necrons must change, not the rule. Since we're in the middle of modifying the rules right now anyway, we can simply bump the price on the Necron Warrior formations by (just throwing this out) 25 points and be done with it. Maybe the Destroyers too. It doesn't affect the Monoliths, Obelisks, or Pylons.
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author of Syncing Forward and other stories...It's a dog-eat-dog world, and I've got my Milkbone underwear on.