Hey there, you can link the Steam and Epic accounts and set up 'cross save'. That will make your Steam characters playable on Steam and Epic, nothing is merged or transferred, you're just allowing Epic to use your Steam character profile. I see you've linked the accounts already, cross-save is the next step.
https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide
DLC is locked to the platform on which it is owned. But with cross-save set up like this, you can play your Steam characters through the Epic Games launcher and access DLC owned on Epic.
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I got the legacy addition on epic games, which comes with some dlc. I am looking at getting seasonpass and lightfall to access more of the game, but its a whole lot cheaper on steam atm. So if i set up cross save could i access the seasonpass and lightfall from the steam if i buy it off steam, I assume ill lose access to the dlc on epic? Please and thank you
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Like the above example you can cross-save Steam and Epic, so when you play on Steam and on Epic you see the same characters. When you play on Steam you'll have access to DLC you own on Steam, and when you play on Epic you'll have access to DLC owned on Epic. However the season pass counts as an in-game purchase, so content specific to Season of the Wish will be available regardless of which you play on.