These are usually pretty clearly marked on the map with big shiny yellow icons that show you still have the potential for a powerful drop there. But as of a few days ago, there are a new pair of powerful drops you can get that the game is not advertising at all. But there’s actually another level to this that will get you two more powerful drops per character, per week, as best I can tell. Any time after this, you will get materials and a Vex Offensive drop, but it will not be powerful. I was soloing Gate Lords at about 915 power, but for the final Gate Hydra, that’s a different story.
Source: Forbes October 08, 2019 13:30 UTC