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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Oryx and the Taken army had the Cabal on the run in the first place. Now, with Oryx dead, both in our and the ascendant realm. The Cabal army has nothing more to fear. You'd think they'd be the slight bit grateful. We killed the thing that had them on the run for years. What makes them think they can take us?