All materials that will be unavailable after Destiny 2 Season 19

gamepur.com:

A handful of changes will happen in Destiny 2 when Season 19 arrives. Multiple materials you could obtain by exploring one of the planets in the game will become unavailable. You won’t be able to receive them for completing public events or when you unlock chests on the planet. These will be removed from the game, freeing up inventory space for your Guardian. We will cover all materials that will be unavailable starting in Destiny 2 Season 19.

Six materials will be disappearing from Destiny 2. They will go away in Season 19, which gives you plenty of time to empty them from your inventory and start turning them into Rahool, whom you can find in The Tower.

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These are the materials that will be going away in Season 19.

Before Season 19 and after, you can exchange them with Rahool for 5,000 Glimmer for a stack of 20 destination materials. However, if you have less than 20, you can receive 250 Glimmer for everyone you offer to Rahool. This will be the case for every destination material moving forward in Destiny 2, so if you still have any sitting in your inventory, Rahool will gladly accept them, and Rahool will begin accepting Dark Fragments, Phantasmal Fragments, and Herealways Pieces for Glimmer.

The reason for this change made by Bungie is they want to give players more to do while visiting planets in the game. With these destination materials going away, there is a gap in how players earn Glimmer. To make up for it, the team will be giving public events, specifically the Heroic Ones, a significant boost