So, your heroes are planning a leisurely cruise on the waters of the Styx. What could possibly go wrong? As it turns out, quite a bit. The river itself is a treacherous serpent, its waters as toxic as a viper's venom, draining the faculties of those unfortunate enough to sip or tumble into its oil-slicked depths. This waterway is no tranquil passage; it teems with fiends, demons, bounty hunters, and assassins lurking at every bend. Along its banks, the Blood War rages incessantly, with fiendish war machines and looming citadels patrolling its winding course. Yet, undaunted, your heroes are prepared to navigate its length. They will need more than just luck; they must cling to their sanity amidst the chaos.
In this supplement, we provide material designed to assist you, the Dungeon Master, in crafting encounters rich with detail. These narratives will complement and enhance the stories that unfold in Chains of Asmodeus and Descent into Avernus. Are your players truly ready for a 'leisurely' cruise on the Styx? With this guide in hand, let's embark on a journey to discover just how prepared they are for the perilous waters that await.
- from the publisher's blurb