For about a week or so, a mystery has caused a lot of heartache for Destiny 2 player. What is the Lost Secret Triumph Festival and how do you complete it? Now we know what you need to do to complete this Triumph Spider Vision secret. 
The first thing to do for this secret triumph is to visit Eva Levante in the courtyard of the tower. You will need to buy him a Festival Charm for 100 Candy. Festival Charm increases the number of Weird Chocolate Coins awarded to you for completed activities and the Haunted Forest.
Head to the Haunted Forest and make sure you have the Festival Charm in your inventory. Once you've loaded, open your inventory, go to the Consumables tab, and use the Festival Charm. Afterwards, play through the haunted forest, but make sure to aim deep when killing items. After a while, the triumph should just end.
That's it, nothing too delicate here. It looks like most of the mystery stems from the fact that the Triumph was only added to the game this week. So, for the past few days, we've only been chasing away ghosts and rumors.
There is some conflicting information, but I can assure you this method works. I ran the Haunted Forest without the festival charm, and nothing happened, but I had the triumph before I even passed the first plate with the festival charm active.
I have also noticed that some players are reporting that the Triumph is finished, but nothing is happening on their screen. In past celebrations, a spider would crawl across the screen as you took aim. I'm not sure if this is an intentional change or a bug, but you will see that Triumph is done by following the usual message flashing at the bottom of the screen, letting you know you are done the Spider Vision Triumph.
