Chronicles of Darkness vs METTLE Core

Compare Chronicles of Darkness and METTLE Core side by side. See differences in complexity, dice, genre, cost, and more.

	Chronicles of Darkness	METTLE Core
Genre	Horror, Modern	Universal, Modern
Tags	Atmospheric, Character Building, Character-Driven, Classless, Corruption, Drama, Fear & Stress Mechanics, Improvisation, Investigation, Strong GM Support	Pulp Action, Toolkit, Hackable, Rules-Light, Classless, Fast-Paced, CC-Licensed Rules
Core Mechanic	Build a d10 pool from an Attribute plus a Skill and count each 8, 9, or 10 as a success. Tens reroll, five successes are exceptional, and a pool reduced below one die becomes a chance die that succeeds only on a 10.	Roll a pool of d6s equal to the Attribute being used. Dice showing 1, 2, or 3 are summed as the Score; dice showing 4, 5, or 6 are counted as Edge. The Check succeeds if Score meets or exceeds the Difficulty (Routine 1 to Nigh Impossible 15), and Edge measures how well it went. On a failure with Edge, the player may call for a Twist: accept a complication proposed by the rest of the table, then reroll the Edge dice for a second chance. Initiative passes from the acting character to the target of their Action, who becomes the next to act. Mettle (Motive + Nature) acts as a combined morale and damage track, and characters may Surge by spending Mettle for bonus dice on critical Checks.
Dice	d10 dice pool	d6 dice pool
Complexity	Medium	Low
Accessibility	Medium	Very High
Runnability	Very High	Very High
License	All Rights Reserved	CC BY 4.0
Third-Party Publishing	Commercial publishing allowed — Storytellers Vault	Not yet researched
Summary only, not legal advice. Check current terms before publishing.
Cost	$	Free
Publisher	Onyx Path Publishing	Planarian Games
Year	2015	2021
Best For	Groups who want modern supernatural horror built around investigating mysteries, navigating personal consequences, and confronting threats before they overwhelm an ordinary life.	Groups who want fast pulp action-adventure in the vein of Indiana Jones, James Bond, or Tales of the Gold Monkey, with a hackable toolkit they can bend toward detective stories, wild-west gunfights, post-apocalyptic survival, or grounded science fiction.
Highlights	The investigation system can reveal an Incomplete clue on a failed roll, preventing a mystery from stopping at one check. Conditions, Aspirations, and Beats link consequences and personal goals to character advancement. Horror Anchors create investigative inroads for supernatural threats.	Score-and-Edge dice pool reads two outcomes from the same roll: whether the action succeeds (Score meets Difficulty) and how well it went (count of 4–6 dice). Player-invoked Twists let a failed roll be reframed as a messy success in exchange for a fictional complication chosen by the rest of the table. Six-attribute character sheet (Calling, Culture, Frame, Motive, Nature, Poise) replaces classes and skills with player-written Descriptors that justify which Attribute applies to a given task. Initiative passes from the acting character to the target of their Action, eliminating turn-tracking and tying combat order to who is acting on whom.
Considerations	The core contains detailed procedures for combat, chases, investigation, social maneuvering, and supernatural threats, so groups need to decide which rules to emphasize in a campaign. Damage, Integrity breaking points, and Persistent Conditions create lasting consequences. Social Maneuvering includes sexual goals and hard leverage, so players should back away from uncomfortable concepts.	Toolkit framing means the book provides scaffolding (factions, NPC seeds, sample castaway adventure) rather than a fleshed-out setting: groups expecting a defined world will need to build or borrow one. Mettle does triple duty as morale, hit points, and a spendable resource for bonus dice, which can take a session to internalize. Twist resolution depends on the rest of the table proposing complications, which slows play if the group is hesitant to add fiction.