To make sure you’re working on the correct thing, Step 8 of [b]In the Shadow of the Mountain[/b] requires you to enter Hefnd’s Cairn through the Taken Blight located at the bottom of the spiral staircase leading up to the final encounter: once inside you just interact with the skull and then travel to the Tower to speak with Ikora and finish the Quest. [i]After[/i] you have fully completed the Quest you will need to return to Warlord’s Ruin, complete the three puzzles scattered throughout the Dungeon and then return to Hefnd’s Cairn to complete the special encounter. The puzzles and encounter can all be completed Solo, but the timing for the puzzle by the Bridge will be very tight without any fireteam members and may take several attempts. (΄◉◞౪◟◉｀)