The Infinite Plane

A 700,000 km Disc World overseen by the Necronians. Explore the First Edition (2026) ruleset, from d20 mechanics to the AI-driven dungeon logic.

Interactive Simulation

System Logic Visualizer

Experiment with the core math of IPRPS. Adjust attributes to see derived stats, or manipulate dungeon signals to see how the AI responds.

Derived Statistics Engine

Enter core attributes to calculate HP, Speed, and Dodge as per Section 2 of the rules.

Hit Points 10
Basic Speed 5.5
Will / Per 14
Dodge 8
*Formula: Speed = (DEX + HP) / 4. Dodge = Speed + 3.

IPSM-AI Signal Tracker

Adjust the "Five Signals" to see the Threat Budget calculation.

Threat Budget
2
Patrol Spawn

Gameplay Mechanics

IPRPS uses a "Roll-Under" d20 system combined with realistic derived stats. Success is determined by rolling equal to or lower than your skill.

Success Rolls

To succeed, roll a d20. The result must be ≤ Effective Skill. Modifiers apply to the Effective Skill, not the die roll.

Unified Size Modifiers

Size impacts combat physics directly.

  • Small (Size -1): -2 Damage, 1yd Reach. Harder to hit.
  • Large (Size +1): +2 Damage, 2yd Reach. Resistant to knockback.
  • Weapon Scaling: Using mismatching weapons incurs penalties.

Shock Penalties

Damage taken creates a "Shock" penalty to DEX/INT skills on the next turn only. Max penalty is -4.

Character Creation Tiers

Points allow purchase of Attributes, Advantages, and Skills.

Species Quirks

Every species in the Infinite Plane possesses unique physiological or psychological quirks that define their roleplay and mechanics.

👤

Human

Short Lifespan

Driven by their mortality, humans are ambitious but biologically fragile compared to ancients.

🐱

Cat Beastfolk

Distractible Instincts

Highly agile but prone to losing focus when stimulated by movement or shiny objects.

🦅

Bird Beastfolk

Hollow Bones

Capable of flight or gliding, but suffer increased damage from blunt force trauma.

🛡️

Dwarves

Rigidity of Thought

Stalwart and dependable, but struggle to adapt to rapid changes in plans or magic.

🔥

Demons

Binding Vulnerability

Powerful magical affinity, yet susceptible to summoning circles and binding rituals.

🤖

Constructs

Maintenance Dependency

Do not heal naturally. Must be repaired using engineering skills or Nanytes.

IPSM-AI Logic

The "Pattern Lock"

The dungeon is alive. If your party repeats the same tactic (e.g., casting Fireball 3 times in 5 rounds), the AI triggers a Pattern Lock.

"Enemies gain Advantage on saves against that specific tactic, and traps realign to punish it."

The Five Signals Definitions

  • 🔊 Noise Spike (NS): Explosions, shouting.
  • ✨ Magic Sig (MS): Wards, sustained spells.
  • 🩸 Blood Scent (BS): Wounds, necromancy.
  • 💎 Loot Disturb (LD): Traps, chest opening.
  • ⏳ Time Drift (TD): Teleportation, chronomancy.

Threat Budget Formula

(NS + MS + BS + LD + TD) / 3

Rounded down to determine Response Points.

1 Point Spawn Patrol / Arm Trap
2 Points Reinforcement Wave
3 Points Mini-Boss / Shrink Safe Zone
4 Points Boss Phase / Hazard

Session Master Tools Editions

Feature Lite Edition Pro Edition Ultimate Edition
Max Users 3 Users 5 Users 8 Users
Audio Conferencing — P2P WebRTC P2P WebRTC
Data Storage Hybrid (MySQL/JSON) Hybrid (MySQL/JSON) Hybrid (MySQL/JSON)
File Upload Limit 200 MB 200 MB 200 MB
Exclusive Tools Basic Dice Local Media Player Whiteboard + AI Clearing

Negative HP Rules

Death is not immediate at 0 HP. Survival checks occur at -1×HP. Automatic death only occurs at -5×HP.

Support

For official updates, visit infiniteplane.space. Contact support@infiniteplane.space for help.