Sounds like neither do you the ttk required the previous dlc and they didn't change the coding much they could have made it where the rise of iron didn't require the taken King this is activision way of making money on previous dlc that didn't buy the previous dlc
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TTK required the previous DLC because those pieces of code were required for TTK to run. I'm a -blam!-ing computer science major homie. I know my shit, and you have no idea what you're talking about.