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Blizzard says that modding Diablo IV can result in a permanent account ban
(www.techspot.com)
This is a most excellent place for technology news and articles.
You can still try the earlier Diablo games. Diablo 1 with Belzebub mod is pretty fun (or get DevilutionX if you want a more authentic experience but with some modern QoL stuff), Diablo 2 with Project Diablo 2 mod is even more fun (probably the best Diablo variant IMO), and there's also Blizzard's official Diablo 2 Resurrected, if you can't tolerate old school graphics.