DISCUSSIONS on “Rules for online games in HoMM3 and formulas for calculating player rating.”

No need to ban it; this spell makes the game more interesting – just add a requirement (resource gathering) for those who want to use it. Let them build a magic guild for it, perhaps on the 5th level, or as the rules dictate for scrolls: if there's no 5th level, use the maximum levels in two castles. And when gathering these resources, which are often depleted to zero for buying or building, they'll either have to slow down their main army or learn to play the entire chain at full capacity – who knows, it might even benefit their overall skill!

As for Explosion and similar spells, I don't know; maybe only allow it from the 2nd month, or even better, introduce a limit on the number of Explosions per battle: 1 or 2... They did the same with Devastation, and why shouldn't they do it with Explosion? It seems like half-measures. I'll never believe that Devastation will be more effective than 4-5 "bangs" of 2000 damage in the final battle.