For both games, the following data is preserved and transfers automatically — no player action required :
For Lost Ark specifically, the official FAQ states "no changes will be made to your Steam account, your characters, progression, inventory, purchases, entitlements, wallet balances, etc." — everything transfers as-is to Smilegate .
For Throne and Liberty, NC confirmed "all assets are preserved, including character information, gameplay progress, inventory, and purchased items" . Players on Steam, Xbox, and PlayStation will see no changes to their current gameplay experience
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Some ephemeral social and local data is lost during the transition:
This announcement marks the complete end of Amazon's MMO publishing ambitions: