Does the Legendary Bundle 15% discount not apply to "3rd Party" content?  Specifically, I'm not seeing the discount apply to Dungeons of Drakkenheim and Lairs of Etharis.  On the Legendary Bundle splash page, it states:

You will also automatically receive a 15% discount off standard pricing for all future digital Dungeons & Dragons sourcebook and adventure book purchases on D&D Beyond!

Are these "3rd Party" content not "Dungeons & Dragons"?

They are third-party content for Dungeons and Dragons, not Dungeons and Dragons content—the distinction being that they are not produced by the holder of the Dungeons and Dragons trademark, and therefore cannot be produced under the D&D brand umbrella.

I think it is pretty clear that whatever the licensing agreement might be, the third party producers did not agree to any discounts on their products.  They are not in the legendary bundle; they are not eligible for the legendary bundle discount: they are not eligible for the sales (like the present sale); and you cannot buy them piecemeal.  

3rd party stuff is not Official Dungeons & Dragons Sourcebooks and Adventure books. They are 3rd party.

So, no, they do not count for the discount.

Thank you Caerwyn.

D&D Beyond, would you all add clarifying language to the Legendary Bundle splash page noting that "3rd Party" content is not eligible?

And really this is a positive in terms of supporting 3rd party content producers on D&DB; they’re inevitably paying a fair chunk to have their product sold and more importantly supported on this platform, and adding a discount on top of that would only further cut into their profits and make being here less attractive.

Quote from The_Ace_of_Rogues >>

And really this is a positive in terms of supporting 3rd party content producers on D&DB; they’re inevitably paying a fair chunk to have their product sold and more importantly supported on this platform, and adding a discount on top of that would only further cut into their profits and make being here less attractive.

Agreed. It's logical that the Legendary Bundle wouldn't work as a discount for this, but the phrasing really needs to change because I bet countless people won't realize "official" content disqualifies 3rd party products from receiving a discount via the bundle.

I think it all could do with a look over. I saw that XGtE was 43% savings, but noticed that it didn't seem to be taking into account that I'd already bought parts of it. Apparently, which discovered from visiting in incognito, it was 10% savings, but has lumped in the "discount" as part of the savings due to the sale.

There are a couple of things that could do with being clearer what's happening.

Imagine you sold shoes. They cost $8 to make and you sold them for $10, so you make $2 profit per pair. Then you make a deal with a nearby store to sell your shoes to a lot more people, but they get to keep $1 of the profit so you only make $1 per pair. Still a pretty good deal since you get a lot more sales.

Then one day they have a 20% off sale and sell your shoes for $8. They still get their dollar, so you get $7 for a pair of shoes that cost you $8 to make. You lose $1 for every pair they sell.

This is why 3rd party content isn't a part of official D&D content discounts.