Here's a nasty proposition. Wanda and crew approach the tower to parley, Slately or Tremennis do what Wanda did and fire off the whole of the whole tower defense system in one shot, incinerating all of them.
Why (apart from plot armour) not?
a) It wouldn't be noble.
b) They will almost certainly be the ones initiating the parley, what better way to make sure no one trusts them again ever.
c) They probably don't have the fire power to blast everything out of the sky; notice how numerous units survived Wanda unloading everything. Well a handful orlies and a warlord. But Wanda's airforce is composed of dwagons, a lot of stuff will survive. And Wanda will almost certainly shield the first volley away, so she will survive until she runs out of juice.
It might provide protection from croaking. As FF would say "auto-decrypt". But that is just speculation. (Would be kind of funny if the incapacitated Wanda was croaked only to come back more powerful.)Or a possibility that an Arkentool can provide some protection from incapacitation? (I remember fallen Wanda asking Ansom to touch her with the pliers).
Also has Wanda tried doing anything with the arkenpliers other than decryption? Like a croakamancy death spell?