Destiny 2 loves giving players secret missions for exotic gear and Lightfall isn't bringing that tradition to an end. If you head to the EDZ and land in The Gulch, you might notice a series of Vex nodes floating around and chirping out some kind of message. Collecting these is the first step in a new quest to get the Exotic glaive, Vexcalibur. Here's how to get it:

First collect all six Vex nodes

There are six of these nodes scattered around The Gulch and you have to collect them all under a time limit. Luckily for us, the time limit is pretty forgiving to begin with and collecting subsequent nodes adds time on top of it. Here's where to find all six of the nodes:

This node sits just under a stretch of broken highway near the lost sector to the south.