Spire of the Void Caller

From publisher blurb: Adventure Framework 20 Spire of the Void Caller consists of: A downloadable, bookmarked PDF (10 A4 pages, excluding cover & credits, in both parchment and white backgrounds). The Core Adventure (in this instance, exploring the Suurat Jungle to delve the Spire's catacombs, occupied by serpentmen and other foes), that will occupy 3-8 hours of session time with Minimal Prep. Rumours & Hooks suggestions.