Now I've spoken at length about the real need for heroes & adventurers in OSR & old school campaign. I've spoken at length about the veneer of Dungeons & Dragons as well as it use in old school campaigns. But when you start looking into the mind set of Dungeons & Dragons especially the length & breath of campaign several things become apparent. Even with large groups of players & their PC's they might not cover every event in a world spanning campaign. Take a look at Wraith of the Immortals box set for exactly the sort of weirdness I'm talking about.
Now start thinking about campaign shattering locations as well & let's look at the recent inclusion of Venger Satanis's Cha'alt. The appearance of the world setting of Cha'alt in my own game campaigns has caused a complete shift of attention from the Islands of Purple Haunted Putrescence. And this is fine with me because the islands could & will comeback to bite the players in the ass again. The same way that events from the Wraith of the Immortals box set can & will bite player's PC's in the ass. Just because you might be high level or even demi gods in my campaign's case because I'm using Godbound as my base system doesn't mean that events in a campaign don't continue to unfold around the PC's!
Los Vegas has been ravaged by the appearance of Cha'alt & the black pyramid! The events continue to unfold between sessions as factions get stronger & weaker. There are other NPC adventurers & player heroes in play all of the while that my main group of player's PC's are working their way through Vegas. Both Godbound & Cha'alt have built in faction event generators built right into the systems. As the dungeon master I'm taking prime advantage of this fact! 
Right now I'm using those same rules & random generators to pull material & update stuff from the Islands of Purple Haunted Putrescence. Especially some of the weird alien factions that aren't complete fleshed out in the main island book.. These are being taken to the next level. The Islands of Purple Haunted Putrescence have in fact manifested right of the Gulf of Mexico in my Friday night game. Several US army officers have come under the influence of The Mighty Servant of Leuk-o. But this version of the Mighty Servant has its own ideas & I'm incorporating some of the ideas from Dead God Excavation.
Now all though this may not seem like its straight out Basic/Expert Dungeons & Dragons campaign don't let the gonzo paint job fool you. I've been reading through Frank Mentzer 's Immortals box set along with Advanced Dungeons & Dragons first edition's Deities & Demigods. The gods from these sets are at a whole other level of reality then any of the Godbound. But they may not be put into an adversarial NPC position but instead their help might be needed to help put reality right in this campaign.
Yes I totally stole this picture from wayne's books but the fact is that words of godbound have a limited influence within a campaign's time space continuum. But the immortals use spheres of influence over such as time, space, entropy, etc. This takes full advantage of the fact that immortals take the place of gods as agents or arbiters in other realities. The PC's might need their help repairing the damage that the Lovecraftian agents of chaos have done. That is if they can?!
This takes campaign events full circle & brings it back into the D&D fold once again. But more importantly it pushes a Mythological adventure narrative unto the campaign..
Happy bday Venger & the Satanis family!
"This is the third boxed set of the Dungeons & Dragons game series. The first, the D&D Basic Set, introduced the game and explained the rules for 1st-3rd level characters. In the D&D Expert Set, character levels 4-14 were detailed, along with notes on the fantasy world in which the characters live.
If you started with a 1st character, and have enjoyed the wilderness expansion of Expert level play, then you are ready for this set.
You can also use this set if you'd like to discover what it's like to own a medieval castle. You can rule a land, bring civilization to the wilderness, and cope with all the threats to your territory, while facing monsters and magic of all kinds.
Your adventures will be different than ever before. Lower level characters must keep busy surviving and learning; but when you find the challenges lacking, or treasure too easily found, you may start to wonder?"Is there anything more?"
There certainly is! Games for higher level characters are often different?as new as when the characters first braved the unknown wilderness."
When we get down into the history of this set its all about Wilderness folks but lets get that history outta the way shall we, "The D&D Companion Rules Set (1984), by Frank Mentzer, is the third volume in Mentzer's BECMI rules series. It was published in June 1984." This is the box set that introduced 'the War Machine system' According to the Drivethrurpg entry; "Douglas Niles and Gary Spiegel to create the game's new warfare system. He asked the two for: "a fast, easy-to-run, uncomplicated but expandable, comprehensive but not tedious, all-new state-of-the-art method for handling REALLY large battles, something that newbies could embrace but that old-schoolers could use without squawking".
Easy.
The two delivered one of TSR's best received mass-combat systems, the War Machine. Niles would go on to produce a few other mass combat systems for TSR, while Spiegel would unfortunately fall victim to one of TSR's layoffs of the mid '80s."Something no one seems to take about is the fact that the Hollow World is the perfect place to test out the D&D Companion rules box set by Frank Mentzer. Its perfect for taking over large swaths of underground world of Mystara.
Its too bad because the War Machine is ideal suited to bringing the conflict, blood shed, & horror of tribal warfare to the Hollow World & the PC's can be at at center of it.
But the spell of Preservation would prevent 'XYZ' from happening.. Umm the players & dungeon master's play overrides any story element. Besides the inner world is full of undead such as the phantom, haunt, and spirit perfectly suited to give the player's PC's a run for their money. The companion set has some addition power to add into 'The Hollow World' setting such as high level dragons which could be leading that country or kingdom that the player's PC's have heard about. Finally you can actually unleash a black dragon NPC upon a Mystara campaign with some real 'heat'. Want to scare a group of players try taking on a Black Dragon within its own element with lizardmen or bullywug mercenaries.
When it comes to absolute essential information Who’s Who in the Wyrmsteeth part 2 by Francesco Defferrari from Threshold issue #9 is a must.In fact that whole issue is key if your doing anything Hollow World related.
The Companion rules complement the ritualized wars that are hinted about in the Hollow World box set & can now be carried out. Finally you get a solid set of rules to handle the dragons of Mystara & still make sense of carving out a kingdom. Somehow I've never seen the Hollow World with empires like the Sons of Azca as particularly stagnate.
The really interesting part of this is that over the years I've used different gateways in dungeons, tunnels, etc. to connect 'my own version' of the Hollow World to different OSR settings. Yes this isn't Mystara anymore but its made for a very dynamic & enjoyable game or two after the failure of the spell of Preservation from events of Wraith of the Immortals. In fact the PC's were recruited by the Immortals to help drive out the various interlopers who came to call on the Hollow World setting. The Council of Intrusion was responsible but spread very thin by the events of Wraith. 
And here's where the Merry Pirates come in to take full advantage of the chaos happening within the Hollow World. Their not worth the effort to take down by group of high & mighty immortals or are they? See this is where the naval rules of BECMI Dungeons & Dragons come in very handy. The higher level immortals have to come in to put things right & do a reset. Remember I mentioned those dragons? This is exactly when the PC's can expect to see tooth, claw, & breath weapons turned loose. There are always ramifications when it comes fall out from the events of a module. The real question is do the followers of entropy slip in as well?
