Soloing them gives players a chance at earning new Exotic armor. The Legend and Master Lost Sectors have different rewards. For those that manage to complete it solo (with no fireteam), there’s a good chance at one of the new Exotic armor pieces added with Beyond Light. There are a variety of rewards for completing a Legend or Master Lost Sector in Destiny 2. It can be worth waiting to try one you're more comfortable attempting. Each day will have a new Legend and Master Lost Sector for you to attempt. It's also worth noting that the Legend and Master Lost Sectors may be on a random rotation. Consider coming back once you’ve hit a higher Power level. There’s a good chance these may be too difficult to attempt early in the season. The Legend and Master Lost Sectors have different Power level requirements: A banner out the front of the day's Legend or Master Lost Sector will let you start it up. This will place you in a new instance, where the Lost Sector’s modifiers will be active. To do this, you must physically go to the Lost Sector and interact with the banner outside its entrance. With the Legend and Master Lost Sectors unlocked, you will no doubt want to start one.
How to start a Legend or Master Lost Sector Right now, it looks like only the Cosmodrome and Europa have Legend/Master Lost Sectors. The Master version has a sword through the shield. You can tell which Lost Sector is Legend or Master by looking at the map and finding the unique, purple icon. With those steps complete, you will now find that Legend and Master Lost Sectors have been unlocked. Besides, it’s you’ll no doubt want to try and hit the new max Power in Destiny 2. If you’ve yet to reach that Power after the campaign, spend some time farming Strikes, completing Public Events, and otherwise working on Milestones. You should be able to reach this by completing the Beyond Light campaign. Secondly, you must reach at least Power 1200. Here's a guide on the location of all Lost Sectors in Destiny 2, including the new ones on the Cosmodrome and Europa. This will clear the Lost Sector on the map. That means going to the patrol zone, entering the Lost Sector, defeating the boss and looting the cache.