TTK: Year two. Destiny: Year one. No seriously. Year one. When they said they were leaving year one behind, they were serious. Kinda like moving. Your eventually also going to be locked out of VOG, CE, and PoE. Along with IB and ToO. They will all eventually come to year two. TTK is your key to year two. You need to buy that key. So it kinda sucks. Not like I'm complaining. I love destiny and TTK is the best thing that happened to destiny IMO. Don't judge me, it's fun.