There is a lot of homebrew that I added in. I tied in NPCs from the PCs back stories. All the lose ends from the Dragon Heist adventure I’m also directing to down there such as the fleeing Skeemo Weirdbottle is making his way to skullport now. Some is already in the adventure like the Xanathar guild.
The gameplay is very different but the party said they wanted to try it and it’s a nice change of pace. But I make sure to expand some of the roleplay elements down in the dungeon to be more prominent. Overall the dungeon is pretty well designed imo so it all ends up working out well.
Currently they are back to Waterdeep to deal with the Xanathar once and for all.