From the publishers blurb:
The History of Neraka Valley is a tetralogy of adventures revolving around a singular narrative.
Each one weaves a fragment of the epic of an ancient temple nestled in a small, secluded mountain valley, from the present times to the days of yore.
The second adventure, The Unleashed Evil, is tailored for low-level characters, ideally those who survived the first chapter, The Lost Temple: the brave townsfolk of Neraka. Here, characters without heroic skills or amazing powers and weapons (but now with a hint of experience and awareness...) must face undead creatures, traps, and ancient mysteries from the lower level of the mysterious temple they discovered in The Lost Temple.
All the adventures in the History on Neraka Valley cycle are system agnostic. You will find everything you need to play: maps, rooms and monsters descriptions, pcs tokens and even music, but the statistics are limited to the essential. This allows you to easily use the adventures in the main fantasy rpg game systems.