A Baldur's Gate III DLC would be hard to do by DnD standards
Baldur's Gate III development team, Larian Studio;, has explained why the dungeons and dragons rules, especially in its fifth edition, make Any potential expansion of its successful PC role-playing game would be "very difficult" to make.
Larian Studios has confirmed that is not working on any expansion for Baldur's Gate III for now. They might change their minds, but they make it clear that it won't be easy for them.
Don't expect a Baldur's Gate III DLC
Speaking to PC Gamer, Larian Studios' Swen Vincke said the Dungeons and Dragons 5th Edition rules that Baldur's Gate III references make any sequel to the game tread potentially tricky terrain. It would be because he would need higher level characters with game-breaking godlike powers.
He says that level 12-20 adventures require a different way of doing things, in terms of the antagonists they're going to have to deal with. They will require a lot of development to get right, more work than a traditional expansion. He explained that this is why many D&D adventures are below level 12. This comes from his experience with weekly Dungeons and Dragons sessions for several years, and he claims to have seen how characters can become incredibly powerful once their levels hit double figures.
He mentioned the Descent into Abyss campaign, which begins in the city of Baldur's Gate and is designed to end with characters at a maximum level of 13, and in that campaign he already leads into a hellish realm in which players fight literal demigods. I gave as an example that at level 20, clerics can call upon their god to do whatever they want and rogues can turn their failed rolls into successes. Designing all of this into a game that is still balanced and fun would be a tall order., and without taking into account the different endings of Baldur's Gate 3.
Source: Eurogamer

