From the phalanx emerged a single champion. The Wyrmsmoke Mountains shook with the thunder of ten thousand screaming hobgoblin soldiers. Whatever you use, make sure you unify one or more NPCs and at least hint at the menaces of the later main module.
The adventure starts with seasoned level 5 heroes, so a common question is what to use before, and how to connect both locations. Many people around claim to have converted the adventure for their home game, but GiantitP forumer Draz74 is the first to publish his efforts. Its theme differs from that of the current hardcover campaigns, focusing on war and the ticking threat of annihilation by an approaching army of hobgoblins. Red Hand of Doom RHoD, is one of the best regarded adventures of the third edition era, being named in the top 5 modules of all time pre-5e by both EnWorld and Nerdist. So with that worry out of the way, I opened up Google Drive and began the actual prep work for running a published adventure. The adventure uses some standard monsters from the Monster Manual like hobgoblins, goblins, hydras, and giants. After hearing him talk about the Red Hand of Doom and lay out its premise, I got really excited about running this for my group and put the question to them: do you guys mind if we take a break from high-level antics and do something in the lower levels? My group agreed to take a chance with it and I got to work. Enter Matt Colville singing the praises of this adventure on one of his YouTube videos.
Glowing Hand of Doom Halloween Punch Recipe