If you play the "cayde's stash" mission to the end, before you scan the warp drives, there's a pod containing a sleeping gaurdian that you can scan. Your ghost then gives dialogue Spoiler of what your ghost says: [spoiler]Pod #10201. A guardian with exceptional Light sealed himself inside. He's been in there for centuries. Before I found you, I tried to ressurect him, but he preferred to sleep. He said the last war was enough for a thousand lifetimes.[/spoiler] Is there any grimoire hinting at who he could be?