i took it upon myself to actually see if you can get up there.
YOU CAN!
you just need to climb the rocks that lead up to it. i stood on the portal frame. that means that theres no kill boundry.
which means it must do something. bungie put it there for a reason.
now that we know that its accesible. we have to find out how to activate it.
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Its the 6th chest location...