WillieW said:
That's what player characters are for.
If you have a moral quandry about killing Ivid, find a way to raise him from undead and attone for his evil, or banish the army, or put it out of phase, or banish it to an evil plane, have a sleeping plague decimate the army, or shift the good aligned folk to a good plane. There are any number of imaginative solutions. EDIT: Not to mention a Frodo-esque character, who doesn't have to be high level to achieve the end required.
If I were the leader of Medegia, I would have had my clerics throw a foreseeing into the future.
What they saw would surely have alerted me to the imminent destruction of my country.
I would have begged the nymph in the forest to help us, pointing out that her forest would be put to the torch by these marauders.
Had she helped, her Nymph's Aura would have struck down the invaders by the thousands.
I would have used the old Polymorph Other to change orcs into white dragons (in the old rules, an automatic mental change to dragon is ensured) and watched the fun. Or changed them into white puddings and green slimes. Or how about beholders? Or illithid? Or even purple worms (mashed orc, anyone?) Or even nymphs, if the spell would change their minds as well so they gained the full powers.
I would have had my priests Cause Disease on the enemy army, as you suggested, something particularly devastating like the Black Death. Then had Fire Elementals burn anyone trying to escape into Medegia.
Trees are amazingly strong. I would have begged the Treants to activate the trees. And watch as giant oak trees swept orcs up by the dozens and crushed them (ala Isengard in the film.)
Rock to Mud could have been used to sink attackers, or their war machines, or to lure them into structures which were then collapsed.
Heck, I would have gathered every mage and priest available, and brainstormed for *any* answer. And personally gone and begged the 'monstrous' population to help.
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Unfortunately, what goes around, comes around. Every tactic I used or thought of, the superior (more powerful) opponents working for Ivid could also have used.
But at least I would have gone down fighting, and Medegia would have been remembered for it's audacious final defense.
That's from a 'good guy' perspective. Sadly, I still go down in that scenario. Because every trick I can play, they can play better. (sighs)