http://df.magmawiki.com/index.php/Syndrome#Breath_attacks
would it be possable to make a ammo for a catapult or Ballista once hiting the ground or traget it would produce the gas ?
also is it possable to contamenate water with posions
Poisonous catapult ammo.>
Sorta kinda. Normally when they reach the end of their range if they are flush with the ground they cease to exist when they hit something or hit their target, and catapult and balissta ammo is not effected by physics during their flight so they wouldn't explode mid flight.
The only way I can see it working is if you place the catapult so it aims 1 z level above the ground. Normally that causes the rock to fall harmlessly to the ground. But then it does that the rock changes from a projectile back to an item. When it does that you could have the rock set to boil away at 10016 U, and it should explode into a gas when it reaches that point. Then just add the gas as an inhaled poison and it's set. Oh and the catapult would have to be built underground where the temperature is a constant 10015 U to prevent the ammo going off early. And it wouldn't work when the outside temperature is colder than that. I imagine it could be done with a balissta too, but it would complicate matters slightly, since you'll need to smith the metal into a head, and the bolt won't be directly hitting the target anyway, so it misses out of the balissta's advantage.
tl;dr impractical, dangerous, and inaccurate but possible.
As for water contaminant poisons, it is highly impractical. Contaminants seem to dissipate quickly in water. Something in the water near where you dump the contaminant would probably get effected by a contact poison, but drinking it won't hurt anything, and it wouldn't spread over a significant area.
tl;dr very impractical, MIGHT barely function, wouldn't bother
@Max White
I haven't messed much with positions yet myself, only really doing a couple renames. But I don't see anything that looks wrong. Maybe try removing the spouse work exemption from the knight. It might be getting confused that a knight has a spouse but a warlord doesn't.