Thread:Vorknkx/@comment-3547390-20120421171650/@comment-1496755-20120507144133

You are right - Shadow of the Serpent Riders is just like Ultimate Doom. It is fully integrated in the original game and adds 2 new episodes (9 levels each). It was included in Patch 1.3 - so people who had only can the original Heretic could upgrade to SotSR for free (the same way there was a free upgrade patch for Doom ---> Ultimate Doom).

Deathkings is a separate expansion - it adds 3 new episodes. There is one patch for it - it enables music in the new levels (otherwise it doesn't play due to a bug).

Praevus is a more serious expansion - it has new graphics, weapons, monsters and engine enhancements (e.g. weather effects like snow or rain). It also has one patch (1.12a), which fixes several bugs.

Wow, I've always thought about having a real Heretic/Hexen Wiki, but I never had the courage to try to make one. Most other sites dedicated to these games are long gone and forgotten by now. I am a big fan of the series so I can help if you need me :)