During the mission Outbound Signal, you are dispatched to stop the Cabal from transmitting a signal to the Cabal Empire for help, as all of their leaders have been killed. You stop the signal, but it is heavily implied that the signal reached the Empire.
My theory is that in Forge of Gods, that [b]help will arrive. [/b]
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Also, in the Cabal Champions grimoire card, the final line of the card states, "The Empire will have no choice but to respond. " This gives even more evidence that the cabal will come for us soon. [spoiler]But we will be ready. [/spoiler]