How to Defend

[Boron]

Diseases tend to ravage my armies. Enemies casting leprosy are brutal, and troops eventually die off. Is there a defense against this? I know disease does not affect undead, but how about demons or other summons? Out of curiousity, what benefits do demons/devils get?

be glad that your enemy wastes his gems with that
10 death gems for a magic resistence negates spell with the only result of MR-fails throw is diseased is not so scary

as graeme dice has said undead / demons are not affected by this . so try to get an army of them .
if you can't do that you can :
-forge the chalice (heals)
-cast GoH
-if you are arco this is a total gem waste because your arco priestesses can heal
-you can summon 1-2 fairy queens which can also heal

and because mr - negates at least most of your mages / scs are normally not diseased only parts of your army . but they are fodder anyway so don't care and you only lose 1 hp / turn when diseased . so when you have tough units ( e.g. vine ogres ) it takes a really long time until they die ( about 50 turns ) from the disease .