https://www.polygon.com/2018/11/26/18113126/destiny-2-pinnacle-weapon-quests-mountaintop-loaded-question-breakneck

Destiny 2’s fifth season, Season of the Forge, starts tomorrow, on Nov. 27. Like all seasons, Forge brings new rewards for players to grind for, even if they don’t own all the new content.

In Season 4, Destiny 2 players were able to grind competitive PvP for Luna’s Howl, a powerful hand cannon. But in Season 5, Bungie is adding pinnacle weapons — guns that are earned from specific activities and designed to perform well there — like Luna’s Howl for Gambit and strikes as well as competitive multiplayer.