So, I was reading the instructions I downloaded from the site to refresh myself and saw that it said "heirs of blood" was included with the game and was pulling out my hair looking for that book. I was very certain that I didn't have it. Once I dug out my actual instructions from the game, it showed different print showing it includes the quest "the shadow rune" and I said "Ok, that's what I actually have.

So, does that mean that anyone who buys a newer version of this game (I bought mine like 4 years ago) gets that adventure for free and the rest of us chumps that bought it a while ago have to buy the campaign book that is no longer in print?

Exactly. 🤨

The newer release of the base game comes with the Heirs of Blood campaign included, instead of The Shadow Rune.

So if you bought it a few years ago, you have The Shadow Rune campaign and have to buy Heirs of Blood separately (which appears to be out of stock everywhere but they will probably do another run at some point).

If you bought the new game, you have Heirs of Blood but there's no way to get hold of The Shadow Rune - that was never produced separately

It's irritating from both sides, but if you google around you can find PDF versions of the Heirs of Blood campaign book which people have scanned and uploaded, they appear to be decent quality...

Ahh, ok. So then I have a version that newer folks won't get at all. I thought for some reason that new versions came with both.

And I really hope that they do reprints for a lot of Descent stuff. It is SUCH A GOOD GAME!

How would I obtain a copy of Shadow rune, I have a newer copy.

Unfortunately you can't get any official copies of the Shadow Rune, either physically or digitally.

This reddit thread might help.