Speak to the web delegates, also try to figure out, if Sekhmet and Erkhar made it(also, was not Erkhar supposed to be transported to bonefortress for recovery after that battle with sand) Delegates of the web, I want to inform you, that this weapon is not in any way intended to be used against silken nest or bonefortress, since you are equal part of our race, and it is going to provide safety to bonefortress and silken web,aswell.
As for the trade, I am afraid, that if the great council would not posess such strength in its disposal, quite many would rather prefer to just take all your precious steel goods from you with force then to trade, implementation of this defensive system is quite likely to grant us peace and actually increase the trade.
As for the cost, it should not be that great, as majority of energy collectors, focus lenses and aiming prisms are made from glass, any weaver worth his silk can create glass by heating up the sand, and this whole damn world below is literally made from sand.
Parun and Unnamed one, until other primelings recover, and we dont know, if they would even recover from such horrific burns, there are just 3 of us and three legions to protect fate of our species, I hope, that you understand that situation is too dire to be solved with just words, in this same moment, as we speak, whole hostile species of maggots breed constantly willing to consume all we fought for.