Yes, you will need a PSN account to play Hollow Knight Silksong if you’re buying it on PlayStation consoles, either PS4 or ...

You can link your Epic Games account to a PS4 by connecting a PlayStation Network account through the Epic Games website.

The primary reason you'd need to merge two Epic accounts is because you started playing on PS4 and were forced to create a secondary account to play on Xbox One or Switch. This issue was resolved ...