When we first enter the Black Armoury and meet Ada she tells us that this place is not meant for Guardians. Now hold on just a damn second, if the Black Armoury is not meant to be visited by guardians, then why the frick is it located in the -blam!-ing tower, literally the place where guardians gather. Secondly, how the -blam!- does a golden age armory exist in the -blam!-ing tower, and we guardians, you know, the ones who own the the tower, not know about this? Like it's literally located a 2 min walk away from the Vanguard Commanders.... How the hell does Spider know about this place in the tower and we don't? How?......
The only thing I can think of, is that Zavala and Ikora knew about the black armory, but respected Adas choice to not involve guardians. Especially since it seems she's been around since the first Risen and Warlords were still around. I'm assuming she also arms the guards and citizens of the tower and city. But since we had to move from our tower, well we got a bit closer to her, and spider likes to stick hims arms in others business