The communication device directed you to Skydock IV in the Sunken Isles in the EDZ. Complete Lost Sector Skydock IV to discover what Caiatl and her Cabal are hiding.
During your mission to foil Ixel, the Far-Reaching on Nessus, troubling data pulled from Vex prediction engines foretold a series of futures where Zavala has suffered a final death. Crow believes the Cabal will try to act on these predictions and that Zavala is in danger.