I usually play Destiny on the Xbox One, which is where I bought the expansion pass. I recently got Destiny for my 360 so I could play with some of my last gen friends. I need to know how to get the expansion pass back for my 360. I think it's stupid that I would be able to wear and use all of my raid items, but have to buy the expansion again.
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Add ons are platform specific. There is a program that allows a free upgrade for the expansion when going from last gen to next gen. However, there is no free downgrade. To have the expansion on the 360, you would have to purchase it for that console.
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Don't lose hope. Destiny's FAQ about cross-generation DLC stated you own the DLC for both generations. It's similar to the character transfer, you can play either one and still retain both.