Just the annual pass (requires forsaken, useless alone) - https://us.shop.battle.net/en-us/product/destiny2-annual-pass
[b]If you want the pass and you only have the base game; You want the Forsaken + annual pass bundle or digital deluxe - https://us.shop.battle.net/en-us/product/destiny2-forsaken[/b]
Edit: Due to you saying you have the base game from "100% discount", I'm assuming you're PC, disclaimer these are PC links.
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what's the point of annual pass?
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A bit of silver and 3 content patches on a delayed release schedule. AKA: Them wanting more money.