If you haven't played Destiny since D1, you've got a [b]LOT[/b] of catching up to do. It's a completely different game these days. Lucky for you some of the best content is now free to everyone. Try out the Whisper and Zero Hour exotic missions. Both are great fun and give amazing weapons for rewards. You may need the Witch Queen DLC if you wanna get into crafting weapons and if you want the latest subclass you'll want The Final Shape DLC. There's not really anything that's [b]MUST HAVE[/b], depending on what you like/dislike about the game will dictate what you should buy. I've personally found enough value in every DLC to justify buying all of them, but I been here since day 1, so .......

Edit. delete redundant double post.