The Festival of Dreams (5E)

From publisher blurb:

Desire Victory

War began with the new year, as the Ragesian army assaulted the city of Gate Pass.

Now, as the heroes return to where their quest began, the local rebellion rallies to their cause, battling in the streets as they defiantly celebrate a long-delayed holiday.

But Ragesia has far stranger minions than mere soldiers and beasts. Sleeping horrors strain to pass through to the world of flesh, and though victory in Gate Pass is near, the heroes will find their desires turned to nightmares in the Festival of Dreams.

A 5E fantasy adventure for 17th-level characters.