Grim Arithmetic is a Pathfinder Second Edition GM utility for Foundry VTT that estimates short-term danger for a selected player character against a targeted enemy.
The module adds a GM-facing panel that reads the selected PC, the targeted enemy, and the enemy’s supported Strikes, then shows practical encounter-risk information such as hit and critical hit chances, damage range, immediate down chance, expected HP after the modeled enemy turn, dying severity, Wounded/Doomed pressure, Hero Point caveats, and simple resistance/weakness/immunity adjustments.
It is intended as a table aid for quick tactical awareness, not as a full combat simulator or permanent-death predictor. Grim Arithmetic currently focuses on immediate PC-vs-enemy Strike risk using supported PF2e actor data.