Lamech wrote:Hell, the summon perfect warlord spell (or something similar) has already been used to assassinate people outright!
You're talking about Book 0, Episode 66
"In fact, Bell of Easteros was croaked on the spot as an immediate effect
of the summoning process."
Wanda gives us very little information about how that happened. If Bell died in the safety of the garrison of her own capital then how would anyone in Efbaum or Haffaton know what happened to her? Even if that was what happened it couldn't have been a planned effect. Given how critical rulers are to their sides, a spell that can reach out and croak rulers from a distance would never stop being used.
Instead, I imagine that Bell somehow knew about the summoning and how it might turn the war against her. I imagine she lead fliers into the Efbaum airspace in an attempt to croak or capture one of the casters or otherwise interfere with the spell. I'd guess she was there in person because she wouldn't trust her chief warlord to know about magic. Even though it wasn't his turn, I guess The Wizard decided he'd better go ahead with the summoning since it might be his last chance to do it. So then Bell would have invaded the tower, found the spell in progress, did something to try to stop the summoning, and instead got croaked somehow when the spell succeeded. That way everyone would know exactly what croaked Bell, and at the same time no one would try to use that as a strategy for killing rulers.