https://www.youtube.com/watch?v=m-O-IBlZqe8
To get into this new Lighthouse area, by what I done you have to flawless the Trials Of Osiris, you are allowed to lose a game as long as you have the mercy boon on that character, putting it simply you need 9 yellow lights and 0 red lights on your trials passage card to get to the lighthouse. It is probably the most beautiful location in the game, very well done on that Bungie.
Enjoy :)
-
Can you go there again after leaving or does the location disappear?