As far as the old campaigns : -- I would finish LightFall first if you havent. After you unlock strand, you have to earn Strand currency to unlock all the fragments, grenades, etc... so if you equip the strand subclass & go play the other campaigns with it, you'll be earning the Strand currencies at the same time. -- Then play at least the intro mission to Final Shape, so that you can unlock the bare minimum of the Prismatic subclass. You'll have to finish the campaign to unlock some post-campaign missions if you wanna get all the different supers & abilities... OR... you can just join someone who has the missions unlocked & play them to get the supers & abilities. Not sure if you actually need to own the campaign for this. But I've done it on alt characters, to not have to play the campaign on them. *As far as all the Prismatic Fragments, you will need to explore & grind public events on The Pale Heart to unlock all of these. Some are simpler than others, but I do believe you need to own Final Shape for all of this, as well as for the secret mission for the Exotic Class item ... Altho... if you grind the Halloween event enough to earn 2,500 candy, you can just unlock the Exotic Class item from Eva Labante, who will be in the tower till Nov 10. -- Beyond Light will give you the Stasis subclass -- Witch Queen doesnt give you a subclass, but doing some of the campaign will unlock the Relic in The Enclave. You can use it to craft certain Legendary & Exotic weapons with the specific perks that you want. If you've ever gotten a weapon with a red border/box around it, the pattern can be extracted so you can craft it.