https://www.polygon.com/2018/6/15/17468506/destiny-2-forsaken-level-boost-spark-of-light

Copies of Destiny 2: Forsaken will come with a character boost — called a Spark of Light in Destiny — to help new players quickly level up and get right to the DLC, Bungie said in an interview with Mashable. But unlike the original Destiny, this new consumable will now work from the character select menu, and treat the character it’s used on as if they’ve actually finished the campaigns from Year One’s offerings.

The Spark of Light in Destiny was first introduced in The Taken King. It allowed players to boost up to the max level just before the most recent content update. The same is true with Forsaken. This will let anyone who isn’t quite there yet log in and immediately start playing Forsaken’s campaign and content.