You can buy the Beyond Light Legendary pack which contains everything covering those dlc you covered or buy them separately.
All D2 dlc is stand alone but you may need areas covered in some of these dlc to do certain activities (strikes/nightfalls).
Forsaken campaign has just been removed but the pack covers the remaining Forsaken content and a new stand alone Forsaken dlc was added to deal with the remaining content if needed.
And yes you do need Beyond Light for the Stasis sub-class unfortunately.
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Thanks for your fast support and advice...