Another notification from Osiris is present on the War Table:

It's working, Guardian. Each challenge you issue sends another fracture through the Cabal's confidence in Caiatl's leadership. Unruly systems have broken Cabal leaders before. Keep pushing, and do remember to take the spoils of your triumphs. By Cabal law, those offerings belong to you now… maybe we can make something from them with that hammer you're wielding.
-Osiris