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In my experience, both getting Diablo 2 on deck, and playing has been a seamless experience from start to finish thanks to this installation below.
https://github.com/moraroy/NonSteamLaunchers-On-Steam-Deck
-All you have to do is open up a browser on your steam deck.
-scroll down the GitHub page -hit download
-Launch the executable, which should in turn ask which Launchers you want installed.
I chose Rockstar, Ubisoft, Epic and Battlenet all at once. Had 0 issues.
Diablo 2 picks up on the Steam decks controls and has been an absolute blast to play. 70-90 on low preset. I opted for 45fps capped with medium settings.
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I Had to make a post just to give props to this guy and the Non Steam launchers installer, saves a lot of headache and time. It’s straight to the point. But also because I’m quite new to Diablo in general, got D2:R for 13 bucks and have realllly enjoyed it so far. So much so that I went through the effort to get it on Deck.
Looks great on that OLED screen
D2R is an absolute gem. I wish Blizzard borrowed more from D2 / D2R when working on Diablo IV. It’s also my #1 most played game on the Steam Deck.
OP if play offline and also have a gaming PC, you can sync your characters using Syncthing:
https://www.reddit.com/r/diablo2/comments/15qu3jf/comment/jw8c7qe/?utm_source=share&utm_medium=web2x&context=3