Chapter 3: Dice Mechanics

Dice Mechanics Overview

The Mneme system uses 2d6 + Modifiers compared against a Difficulty set by the Referee. The Effect (roll minus difficulty) determines the degree of success or failure.

Modifiers Summary

Modifier Type	Description	Examples
Characteristic Modifier (ChM)	(Characteristic / 3, round down) - 2	STR 9 = +1, DEX 7 = +0
Skill Modifier	Skill level	Gun Combat-2 = +2
Equipment	Gear bonuses	Scope +1, Laser Sight +1
Conditions	Environmental factors	Cover, Concealment, Weather
Actions	Action-based	Aim bonuses, Movement penalties

Difficulty Modifiers

Description	Difficulty	Modifier
Easy	4	+4
Routine	6	+2
Average/Challenging	8	+0
Difficult	10	-2
Very Difficult	12	-4
Formidable	14	-6

Superiority Modifier

When one party has superior position, resources, or firepower:

Situation	Modifier
Superior Firepower	+1 to +3
Superior Position/Action	+1 to +2
Outnumbered (minor)	+1
Outnumbered (significant)	+2
Outnumbered (overwhelming)	+3

Advantage and Disadvantage

Advantage

Roll 3d6, keep the two highest, then add modifiers.

Disadvantage

Roll 3d6, keep the two lowest, then add modifiers.

Cancellation: Advantage and Disadvantage cancel each other out on a one-to-one basis

Effect Calculations

Success Effect

Effect = Roll - Difficulty
Degree determines number of damage rolls (in combat)
Higher effect = better outcome

Fail Effect

Fail Effect = Difficulty - Roll
Degree determines harm to PC
Can be mitigated by: Conditions → Cover → Skills (in that order)

Costly Success

When failure would occur but PC chooses to succeed at cost:

Cost = (Fail Effect × 2) + 3
Success Effect becomes 0
Common in desperate melee situations

Time Resolution

Use median duration, modified by Effect:

Effect	Time Modifier
Success +2	25% of median time
Success +1	50% of median time
Success 0	Median time
Fail -1	150% of median time
Fail -3	Double median time

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