ktsim

Monte Carlo dice simulator for Kill Team attack rolls.

Simulates rolling a pool of d6s against a hit threshold, with support for reroll abilities, critical hit rules, and special weapon traits. Run thousands of simulations to see the full probability distribution of outcomes.

Install

cargo install --git https://github.com/darylturner/ktsim

Build

cargo build --release

Usage

ktsim [OPTIONS]

Options

Flag	Short	Default	Description
--attacks N	-a	4	Attack characteristic of the weapon
--hit N	-H	3	Hit characteristic of the weapon (2–6)
--lethal N	-l	6	Roll this value or higher for a critical hit (2–6)
--reroll TYPE	-r	none	Reroll ability (see below)
--punishing		off	If any critical rolled, convert one miss to a normal hit
--rending		off	If any critical rolled, convert one normal hit to a critical
--severe		off	If no criticals rolled, convert one normal hit to a critical
--accurate N		0	Retain N dice as normal hits without rolling them (0–2)
--sims N	-s	10,000	Number of simulations to run
--output TYPE	-o	hits	Output format: hits or full

Reroll abilities

Value	Description
none	No rerolls
balanced	Reroll 1 miss
ceaseless	Reroll all misses sharing the most frequent missed value
relentless	Reroll all misses

Output

--output hits (default)

Shows the distribution of total hit counts across all simulations, with probability and cumulative probability columns.

  Hits   Count       Prob   ≥ Prob   Distribution
  0      113         1.1%   100.0%
  1      991         9.9%    98.9%   ██████
  2      2925       29.2%    89.0%   ████████████████████
  3      3982       39.8%    59.7%   ████████████████████████████ ◄ mean
  4      1989       19.9%    19.9%   █████████████

The ≥ Prob column shows the probability of getting at least that many hits.

--output full

Shows every unique combination of crits, normals, and misses with its probability. Useful for understanding the crit distribution and the effect of special rules.

  Hits  Crits  Normals  Misses   Count       Prob   ≥ Prob   Distribution
  0     0      0        4        113         1.1%   100.0%   █
  1     0      1        3        733         7.3%    98.9%   ████████
  1     1      0        3        258         2.6%    98.9%   ██
  ...

Examples

4 attacks, 3+ to hit, balanced reroll:

ktsim -a 4 -H 3 -r balanced

5 attacks, 4+ to hit, lethal 5, relentless rerolls:

ktsim -a 5 -H 4 -l 5 -r relentless

4 attacks, 3+ to hit, rending and punishing, full breakdown:

ktsim -a 4 -H 3 --rending --punishing -o full

Credits

ASCII art skull from ascii.co.uk/art/skulls, artist unknown.