QuentinGeorge
Legend
But you did have high damage magic prevalent on the battlefield. You have wand guns and flame throwes, killing machines, flying fortresses, etc. Not the same as modern bombs but very close to WWI. the war does seem to have been a testing grounds for new applications of death and war. WWI lasted a bit over 4 years and killed 20-40 million depending on how you count casualties.
The fronts would be destroyed, but then you have to think how did they conscript people into the war? 100 years is 3-4 generations of population.
If the war was more political swagger and a game rather than actual conquest driven battle then the fronts would be destroyed and numbers of populations would be reduced but other parts would be left functional. If the goal was conquest driven and heavy and consistent, all of the countries would have burned through their money and resources leaving shells of themselves left after the war.
Just so you know, the inspiration for the Last War was more WWI than WWII. It wasn't about conquest, so much. They were fighting over who was supposed to be King of Galifar. The victor didn't want to rule over ashes.