[rtyffg]

Originally Posted by Jarkko

I agree with that. Unless it had some limited area (like AoE 20 for example) too, but I don't know if it is possible to make such a spell.

The minor flaming arrows spell itself seems possible, at least the following lines seem to work (school and paths are to test easyly):
#newspell
#copyspell "Flaming Arrows"
#fatiguecost 10
#aoe 20
#school 3
#researchlevel 0
#path 0 0
#path 1 6
#pathlevel 0 1
#pathlevel 1 1
#restricted 35
#end

Still maybe the other possible change is to add a gemproducing(fire) national summon,
and add a set of drawbacks to that unit: no item slots, immobile, reaper(througn will not disease units but at least"plague" the local population), and with a considerable gold cost(to limit usable numbers). Something like this:
#newmonster 2900
#copysprite 1952
#name "Fever Fetish"
#descr "Gem generator"
#mapmove 0
#ap 2
#immobile
#gemprod 0 1
#gcost 1500
#older 50
#leper 50
#end

#newspell
#name "Place Fevers"
#fatiguecost 100
#nreff 1
#effect 10021
#damage 2900
#school 3
#researchlevel 0
#path 0 0
#path 1 6
#pathlevel 0 1
#pathlevel 1 1
#restricted 35
#descr "The caster gathers magical essence of fevers in the province and places it into a statue. Gathered power brings a statue to life and causes it to spread deadly diseases. Every month a fire gem is created by gathering power from fevers caused."
#end