The Shaman said:
Seriously, could you give me a three or four sentence summation of how the mass combat system works in GT? If it's kewel, that alone would be worth the price of admission.
It's based on EL.
If a group of creatures has EL = X, then the same group of creatures at half strength = X - 2.
Note that we don't care here whether "half strength" means "Half of the creatures are still fresh and half of the creatures are dead" OR "All of the creatures are alive but have expended half of their resources (hit points, spells, etc.)"
As far as EL is concerned, it's the same thing.
The mass combat system is based on the very simple assumption that EL is "accurate" and furthermore that the more creatures that are involved-- ie, the more iterations there are-- the
more accurate it becomes in representing conflict between two groups of creatures.
There are, of course, some complexities thrown in, but in a nutshell the battle attack roll (a Battle Check) goes something like this:
1d20 + Attacker EL vs DC 10 + defender EL.
If the Battle Check is successful, the defender loses 2 EL.
Again, this is the requested oversimplification, but the kernel of the system is the cleanest I have seen in any d20 book.
Wulf