Relayed to me by The Bomb: Remember the Karasu? The previous Crow Summoners that fought souldrinkers with lore given by Karanium? If the Crow Boss really does have valuable anti-souldrinker lore, then we should definitely get the Crows involved in the Dragonwar to help us kill some souldrinkers.
I propose that, during our discussion of the Dragonwar, we bring up what we heard about Karanium and suggest a direct collaboration between Crow and Arachnid. Geographically speaking, Crow is closer to Arachnid than the Conclave (and isn't invited in the first place) so this should maximize the ability for Karanium to contribute to the Crusade when it arrives, I believe.
How about a line like "Hazou's heard that Karanium once helped humans defeat souldrinkers, the support of the Crows could be invaluable for the Dragonwar. Offer what help we can provide in setting up collaboration with the Crows."? Something like this could go in any plan that discusses the Dragonwar.