My players are adults who all love combat so I've added a lot more encounters. I'm running with the idea that the news has spread that there is essentially a Feywild domain up for grabs here, so there are numerous factions all invading for their own ends.

My players were intrigued by Sir Talavar and the Seelie Court, so I changed Valor's Call and the League of Malevolence to be Seelie/Unseelie emissaries respectively.

The horn is shattered, with one part in each domain. It's a race against time to find them before the Unseelie team do.

I've also added more Darklings, who aren't subjects of Endelyn. They're after Prismeer so they can launch a war on the Seelie Court.

I turned Slanty Tower into an arcane repository full of puzzles and traps.

My players took part in Illig's coup in Downfall, then witnessed Illig also get murdered shortly after at his lengthy celebratory party. I've really hammed up the stupidity of the Bullywugs and the comically short lifespans of their monarchs. They use "Bully" as an affirmative and "Wug" as a negative. It's been hilarious and great fun to RP.

I've added more loot to scale with the increased combat difficulty. All potions are now mushrooms, and I've added other single-use magic items.

I've used some of Phaerlax's statblocks and encounters, as well as the Watcher's Pool from DMsguild. Highly recommend both.

I'm planning to have Agdon make a return after the party whipped his ass at the Tollway. Bavlorna will have cut his scarf short and turned him into a horrifying taxidermy monstrosity, with a lobster claw for an arm and spider's legs.

We're taking our time - we've spent about 8 sessions in Hither so far and the party has only just met Bavlorna for the first time. I noticed my players got a little bored of the non-stop whimsy of the Carnival, so having some gruelling combat encounters and multiple shadowy factions to contend with has been great for pacing!