The War Table has a notification from Osiris:

Impressive work, Guardian. You'll get a full briefing soon, but in the meantime, let me fill you in on that Cabal artifact you picked up on Nessus. It's known as the Bell of Conquests.

I've attached a reading with more details, but in short: by claiming that bell, you've officially declared yourself challenger to the Cabal Empire. Caiatl's commanders won't stop coming for you until they see you buried and the bell retrieved.

You made a bold move, but I believe we can use it to our advantage. We'll talk more soon.
-Osiris