I've been searching for over 10 minutes and still can't find it.
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2 RepliesThe one near Vance? See that one is unlocked via puzzle. Around the lighthouse interior there are these things called "Signs of Osiris". There's like 6 or something. The first one is behind Vance (as in he's facing away from it) on the spine of a book. Look for a glowing yellow symbol. Interact and then look for the others that I can't remember off the top of my head. Once you hit all of them, a Vex conduit will spawn to unlock le chest.