https://store.epicgames.com/en-US/p/ring-of-pain
https://store.epicgames.com/en-US/p/destiny-2--bungie-30th-anniversary-pack
The DLC Skin pack requires the base game to use, Destiny 2 is Free to play: (Alternatively you can just add the base game and it auto adds the DLC Skinpack)
https://store.epicgames.com/en-US/p/destiny-2
.