Light, Darkness, & Exploration Survival

Exploration and Survival rules for the Stygian Depths.

Exploration and Survival

Stygian Depths is about surviving in hostile underground environments.

Light and Darkness

This is crucial: There are two types of vision in the depths:

  • Darkvision (dim light only):
  • Deep Darkvision (true darkness):
  • Standard racial darkvision only works in dim light
  • Does NOT work in complete darkness (most deep caves)
  • You still need light sources in absolute darkness
  • Rare ability that functions in absolute darkness
  • Most characters don’t have this
  • Can see in magical darkness

Without Light in Absolute Darkness

  • Disadvantage on everything
  • Vulnerable to ambush
  • Risk getting lost
  • May trigger corruption/mutations

Light Sources You’ll Need

  • Torches (6 hours of light, 30-foot radius)
  • Lanterns (24 hours with oil, 30-foot radius, adjustable)
  • Magical light sources

Resources Matter

Track these carefully:

  • Food and water: 1 ration per day, or you weaken
  • Light sources: Torches burn out, oil runs out
  • Ammunition: Arrows and bolts are limited
  • Spells: Lost on failed casting until you rest
  • Hit Points: Don’t heal automatically

Rest and Recovery

Short Rest (1 hour):

  • Catch your breath
  • Bind wounds (but does NOT restore HP)
  • Eat and drink
  • Risk: Random encounter check

Long Rest (8 hours):

  • Recover one hit die worth of HP (roll your hit die + CON modifier)
  • Regain all lost spells
  • Remove exhaustion
  • Risk: Multiple encounter checks, must find safe location

Travel and Time

The DM tracks time in different scales:

Typical cave exploration speed: Depends on your species, but most move 20-30 feet per turn (10 minutes), slower if searching or being cautious