Whenever I'm patrolling the plaguelands and I'm moving from Lord's Watch to Giant's Husk, Ghost will say something like, "The Fallen are Deploying a Walker" or "Fallen artillery inbound, are you ready for this fight?", making me believe an event is starting in the area I entered or the area I just left.
It's getting annoying.
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I'm surprised that more people haven't said this sooner. I just quit paying attention to my ghost altogether. He's only there for the storage space and ship access.