Re: Acid damage and Bane Fire damage
Aging prevention items will stop decay effects, I believe. If you have boots of youth or the elixir of life, those should prevent death by aging, though I have not tried this.
Other than that, if you want to destroy someone using acid or banefire, the best way to go about it is to use:
Acid: Units with high natural protection not armor. Armor is destroyed by acid. Acid is armor piercing which means that it halves protection when it deals damage the first time, but it is also armor destroying which means that any unit taking acid damage will receive no benefit from armor-based protection until the time they return to a friendly castle with extra resources to repair their armor.
Banefire: Banefire is best countered by units that do not age and who are immune to fire (unsure). Some demons and undead are useful for this. Banefire is very dangerous. Massed banefire crossbow thugs are a common and powerful technique for nations that can field such forces.
In both cases, spells that limit or restrict the accuracy of spells such as Storm, Mist, and Rain are useful.
Beyond that, frequently creatures using these attacks are quite fragile depending on the stage of the game--mages, weak skeleton archers, etc. Battlefield AoE will usually destroy them rather quickly.
There's really not much of a way to be immune to everything. The objective is to make it cost more for your opponent than it does for you. The best way is to kill something expensive and slow-growing with something cheap and easy to replenish.
Slingers, Markata or any cheap massable ranged unit with Flaming Arrows is usually quite affordable for dealing with such things and even if they all die it's no great expense. Whereas killing summoned units, mage commanders, or units carrying magic items with these pathetic things are of significant value. Communions or Sabbaths of low-level mage units can also inflict good damage without any significant equipment and if they die from banefire, you'll care less than your opponent cares about losing his big expensive dudes.
Just teleport/trapese mages in and summon a bunch of elementals or horrors and then retreat (if adjacent to your own land) or use RoR to warp out after. Minimize your exposure. Use your army to lead his on a wild goose chase so that on any given turn he only ever ends up smashing a few worthless PD with his massive, expensive war machine. Make him waste his resources while you use yours frugally.
If you were going to kill a turtle... Would you attack the shell or the belly? If you want to control a snake do you grasp the head or the tail?
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"Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt." -- Sun Tzu
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