Thanks to all those who put work into this. I'll certainly be using a lot of the prepared monsters, with some minor tweaks. I'll ditch the hydra for example, and throw a shambling mound encounter at the party (not least because I have a shambling mound mini
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One thing that might interest prospective DMs of a 4E Red Hand of Doom campaign. With just a little tweaking the recently published Dungeon adventure, Remains of the Empire, serves as a lovely introductory module ahead of the campaign proper.
En route to Fort Vraath the party pass through the village of Elkridge, and come across the warwing drakes (Greenspawn Razorfiend), found and farmed by Bejik. Interrogation of the ghostly dragonborn Vrak reveals that Bejik has had dealings with a certain eagle-mounted goblin ranger and his black dragon companion, who have been transporting many of the uncovered eggs away to the west. The black dragon has also been taught the Mindshape ritual, creating a second hatchery at some undisclosed location.
(DM knowledge only: Wyrmlord Saarvith has convinced Bejik that he shares the dragonborn's mad dreams of the restoration of Arkhosia, and has therefore gained a powerful addition to the Red Hand's forces.)
So the adventure creates some nice foreshadowing of the Wyrmlord Saarvith chapter, and introduces the party to the history of the dragonborn. That history should resonate nicely when we reach the later final chapter of the RhoD (which I will be running as the penultimate chapter, as suggested elsewhere in this thread), and may even serve as a suitable springboard to a post-RhoD campain arc at Paragon tier: an investigation into the secrets behind the conclusion to the Arkhosia/ Bael Turath war based on secrets uncovered in the Chapter 5 dungeoncrawl, for example.