https://www.polygon.com/2018/8/9/17672844/heroic-strike-prestige-nightfall-retired-destiny-2-forsaken

In this week’s This Week at Bungie, the studio revealed how some of Destiny 2’s late-game activities will change when Forsaken is released early next month. This mostly includes strikes and Nightfalls, the difficult versions of which are being retired. Heroic strikes and prestige Nightfalls will instead be replaced with a more streamlined system, designed to accommodate players who purchase Forsaken, as well as those that don’t. Players who don’t own Forsaken will be referred to as “Legacy players” by Bungie going forward.

When Forsaken launches, strikes will have three difficulty settings: power 300, 400, and 500. Once a player has reached 400-power above a difficulty setting, it will be disabled for them, ensuring that the 500 setting will always have players months after release. All strikes will now have modifiers to compensate for the loss of heroic mode. For players who don’t own Forsaken, the strike difficulty will be capped at 200, although modifiers will still be applied.