Spelljammer
Dimensioning
Talent: This talent is also known as Geometer’s Sight

“Space is not what it seems. It bends, lies, and remembers. I simply listen.”

Those trained in Geometer’s Sight perceive the hidden truths of space and structure. To them, distance, volume, and proportion are not guesses—they are certainties. At higher ranks, this awareness borders on the arcane, revealing distortions, hidden voids, and even fractures in reality itself.


Core Ability (Rank 1): Perfect Measure

Dimensioning skill roll: (rank x 5) + ((MA - 15) x 3)

With a successful skill roll:
  • Determine exact dimensions of a room, object, or structure (within inches)
  • Detect inconsistencies (false walls, hollow spaces, uneven thickness)
  • Estimate volume and quantity (coins, liquid, grain, etc.) within 5% accuracy

Scaling:
  • Rank 1–4: Within 5% accuracy
  • Rank 5–9: Within 2% accuracy
  • Rank 10+: Within 1% accuracy; can estimate at a glance without measuring reference




Rank 3 Ability: Structural Intuition

With a successful skill roll, you instinctively understand how things are built. Roll may be modified for well made or magical targets.
  • Identify weak points in walls, ceilings, or objects
  • Gain bonuses to:
    • Breaking objects
    • Avoiding collapses
    • Setting charges or applying force efficiently
  • Can estimate load-bearing limits (e.g., “this floor will give if 4 more people cross”)



Rank 5 Ability: Hollow Sense

You can “feel” empty space beyond surfaces.

Hollow Sense skill roll: Skill roll: (rank x 4) + ((MA - 15) x 3)

With a successful skill roll, you instinctively understand how things are built. Roll may be modified for well made or magical targets.
  • Detect hidden compartments, secret doors, and voids without physical interaction
  • Sense depth and size of unseen cavities
  • Works even through stone, wood, or packed earth out to (rank x 1) feet


Rank 8 Ability: Spatial Awareness

Your perception extends into active environments.

Spatial Awareness skill roll: (((MA + WP) - 30) x 1.5) + (rank x 4)
  • Cannot be easily disoriented in:
    • Mazes
    • Twisting corridors
    • Magical darkness (non-visual orientation)
  • Always know:
    • Exact distance traveled
    • Direction and relative position
    • Gain resistance/bonus vs. effects that warp perception of space



Rank 10 Ability: Distortion Detection

You perceive when space itself is “wrong.”
  • Spatial awareness skill roll may apply at the discretion of the GM.
  • Range is equal to (rank x 1) feet.
  • Detect:
    • Extra-dimensional spaces
    • Illusory walls with mismatched geometry
    • Portals or warped interiors (e.g., “bigger on the inside”)
    • Can identify approximate size of extradimensional spaces from outside



Rank 12 Ability: Geometric Insight

With a successful Dimensioning skill roll at -20, you can exploit space as a tactical advantage.
  • Once per encounter:
    • Instantly determine the optimal position for:
      • Cover
      • Ambush
      • Line-of-effect
  • Allies within range (rank x 1 feet) gain a SC bonus of (rank x 1) when fighting in spaces you’ve “read”. This applies only to archers and others using ranged weapons.
  • Can predict movement paths in tight quarters



Flavor Add-ons
  • Practitioners often carry tools: chalk, string, calipers—but eventually need none
  • Their speech may include odd phrasing: “This room lies.”
  • Dwarves, architects, and certain arcane scholars revere this talent



Old (lame) Description
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The character is very good and determining the dimensions of an object or space. With a successful roll, they can determine if a room that looks to be 20 ft by 20 ft, is really that size or is really a foot or two shorter, which might indicate the presence of a hidden passage.

They are also good and determining volume. For example, if the character sees a pile of coins, then they can make a skill roll to know how many coins are in the pile.