Hi all,
First of all I'd like to introduce myself. I am currently a modder for Neverwinter Nights 2 (nothing notable, my biggest work will come out this winter) and software engineering student. Having loved the first Divinity OS, I now bought the second part to play and mod.
Welcome!
Is this the most active place to ask things, post about releases and so on? I ask because there are forums everywhere (GoG for example).
This will be the primary venue for communicating with Larian as I understand it, so I would start here for sure. I suspect there will be additional places like discord and reddit, but I still think this will be the best choice for a while.
Where are we going to publish mods? Nexus, or multiple platforms?
Thank you for any possible answers. Looking forward to creating cool stuff for this awesome game

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The editor has tools for publishing directly to Steam, but the Nexus is also popular. I think those two cover the vast majority of mods and users.