In Curse of Osiris, Brother Vance is hiding a secret in the Lighthouse. Upon finishing the story missions, and entering the Lighthouse for the first time, drop down to the left of the walkway directly in front of you. You will see an energy wall with a chest behind it. To open the chest, you need to activate some symbols in the right order. You are on a bit of timer, so I would advise you find all the symbols first, then grab them in sequence when you are familiar with the route you need to take.
We’ve got the sequence of books in a video for you here, but you can also follow the written steps below, if you prefer.
The first symbol is over by Brother Vance, on a book on the rounded shelves to his left.
The second symbol can be found directly behind Brother Vance, in a straight line from the first symbol. It is all the way over on the far wall.
The third symbol is just to the left of the entrance, down the small steps.
The fourth symbol is very close to the second, on a table beside an Acolyte of Osiris.
The final symbol is to the right of where you found the third one, you can jump up onto a small ledge there to activate it.
Once you have activated all the symbols, a small conflux will appear in the back right of the Lighthouse. Go to it and activate it to remove the energy wall so you can open the chest.
Within the chest will be 3 Tokens that you can trade in to Vance to increase your standing and a Legendary Engram!
I hope you found this guide helpful, Guardian. If you need help with any other aspect of Destiny 2, be sure to check out our comprehensive Guide Hub.