Or did guardians just go land on it out of nowhere and go "Haha what's this let's rob it" 
I know in season of opulence he sent an invite, but as far as I can tell, the leviathan showed up way before Opulence occurred. What's the timeline and was there any dialogue or anything leading up to the first raid?
						
					
					
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	There were hints and nods during the red war campaign.