family vs family, the rematch

[Zooko]

Until this turn, I thought there was a chance Caelum could get back on top of both of her assailants.

Until this turn, Caelum had decisively won every encounter in which she deployed Elementals. (Except for those darned independent knights.)

However, in this turn both of her armies of Seraphs were chewed up by flying demons before they could cast, thus ending the game.

Now, I studied Construction up to level 4 so that I could create Staves of Storms, but I didn't have the air gems to construct one since I was pumping air gems into the field.

So one possible thing that Caelum did wrong was not searching for magic sites earlier and more thoroughly?

I ask your advice, oh great conquerors, so that I may use it to destroy you in a future life.