The Subterranean Tides: Abolethic Chronology

Forget everything you know about clocks, gears, and linear calendars. In the pitch-black trenches of the ocean floor, time does not tick forward—it ebbs, flows, and pools according to ancient aquatic currents older than the gods. To mortals, time is an arrow, but to the immortal aboleth empires, time is a tide.

The Subterranean Tides: Abolethic Chronology is an atmospheric, deeply textured world-building sourcebook and mechanical supplement designed for Game Masters running deep-sea, cosmic horror, or elder-aberration campaigns. This volume dismantles traditional fantasy timekeeping, replacing it with an entirely alien, non-linear system modeled after subaquatic hydraulics, geologic depth, and collective psychic friction.

What Is Inside This Supplement?

• Chapter 1: The Eras of Rule (Reading the Void). Discover the grand historical cycles of aboleth civilization—The Forgotten Deluge, The Ponderous Tide, and The Unveiling Dream—anchored by the gravity-warping properties of the Floating Non-Euclidean Rings. Includes skill checks and temporal overload rules to simulate the psychological weight of ancestral memories on mortal minds.
• Chapter 2: The Thirteen Tides (Months of the Year). Map out the shifting global motivations of the hive mind across a 13-month calendar tracked by the vertical Bioluminescent Chasm Wall. GMs are provided with actionable table notes, environmental anomalies, and mechanics for every active month, alongside rules for the volatile 13th month: The Interstitial Silt.
• Chapter 3: Hours of the Day (The Pulses). Replace hours and minutes with the shifting daily Pulses of regional telepathic networks. Features detailed faction behaviors and subaquatic environmental traits configured down to precise fractional-hour shifts, tracking the transition from the restful trance of The Deep Dream to the hyper-alert states of The Restless Vigil.
• Chapter 4: The Mechanical Altar (The Calendar Lock Puzzle). A complete, ready-to-run dungeon room encounter based on the Abyssal Tide Pool Matrix. This interactive challenge translates abstract temporal lore into a tactile, physics-based horizontal floor puzzle, complete with exploration mechanics, hydro-chemical siphon sifting rules, and localized fire and psychic backlashes for failure.

Optimized for Shard Tabletop VTT

Built from the ground up to integrate alongside the Scribe's Lost Time Series, this supplement provides Game Masters with clear, scannable GM callout boxes, precise difficulty checks, and evocative flavor descriptions designed to effortlessly drop into your prep or run dynamically mid-session.

Let the surface world trace its fragile dates by the fleeting sun and stars. True history is written in the cold sediment of the sea floor, waiting for the tide to rise again.