@Taricus, since NUKE ninja'd me.
I agree. That would be a hilariously useful development. So, let's say we try this: We devise the fire projectiles first. I believe that they'd do more damage at sea, be more reliable and cheaper overall, at least once they function. So, we design those. Then, we revise them to work, if they don't. If they do, we attempt a revise to enchant them with wind magics. This way, if the enemy rolls a ludicrously lucky roll that inhibits all our magic, we still have bursting, damaging projectiles, instead of glorified, expensive stones. We almost can't lose like this, and we get the best advantage we're going to get.
Now then, what could we do to change things up? Sticking with the advantages we have, making those ballistae better, that will get us a bigger lead---but we need to keep changing the game. How can we do that? If we get the bonus revision, what can we change, and how, to REALLY shake things up? We have to assume they're working their tails off to get rid of the ballistae now. We slaughtered them last time. So next time, how about catapults? Longer ranges, bigger payloads, more death. If we can deploy a few catapults, put one or two on ships at sea, we'll be capable of annihilating huge numbers of enemies, once we've developed the explosive/flaming projectiles.
Sorry, running ahead again. But you've got my vote. If at ALL possible, I want to see the fire projectiles made.
Mindwashing: (1) Crazyabe
Gale Stones: (4) Devastator, NUKE9.13, Detoxicated, Taricus
[Greek Fire bolts: (1) S34N1C
Fire Projectiles: (1) [2?] Madman198237 (Same as above? S34N1C, please chime in here)]
Theoretical Summoning: (2) Egan, Happerry
Weapon & Armour Enchantments:
Obviously, if it doesn't get enough votes, we'll go with Gale Stones instead. I think it'd be a mistake to go with gale stones, but, eS, if it comes to a tie, consider my vote to be with Gale Stones instead.
EDIT:
But the title does NOT mean anything about what we should do! NEVER introduce additional chance of self-harm! Magic is fundamentally unsafe. In a lot of ways. Just ask the mental-hospital patients, most of whom are probably our own lunatic mages from the earlier teletalk experiments. So, we want to be safe as possible. There's almost no chance of us losing out on producing flaming projectiles without magic. We've got sources of oil (Don't we control the whole desert?), we should have quicklime, though that's probably something to add only for a 5 or 6 roll, for goodness' sake I think we should know something about pottery, and we sure as heck had better know what happens when you combine a rag, some oil, and a flame.