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Magic Damage Formula - v40 Reverse Engineering

Overview

This document contains the 100% IDA-verified magic damage formula for MapleStory v40, reverse engineered from sub_515307 (CalcMagicDamagePerHit).

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Formula

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Archer Combat Mechanics (MapleStory v40b)

SpookStory Server Implementation Guide

This document provides comprehensive documentation of the Archer combat system, covering damage formulas, the 7-random heartbeat RNG model, Final Attack mechanics, Mortal Blow, and the RNG recovery system. All formulas and logic are IDA-verified against the v40 client binary.

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Table of Contents

PatrickJS

MapleStory v40 Physics - Fresh Reverse Engineering Analysis

Date: 2026-01-29 (Updated: 2026-02-01)
Method: Direct IDA analysis without existing documentation
Implementation: SpookyStory V2 (MaplePlayerController, MaplePhysicsEngine, MapleConstants)

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Implementation Status Legend

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Physics Pseudocode — All Functions, All Paths (Audit-Verified)

Companion to physics_engine.md

Important

All paths cross-verified against raw IDA decompilation on 2026-02-16. DoJump path ordering was corrected (originally had ladder/foothold swapped). HandleGroundedMovement and ClampToBounds were added (previously missing).

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PatrickJS

name	govuk-style
description	Write and edit in GOV.UK / GDS house style — plain English, active voice, front-loaded content, sentence case, and no bold or italics for emphasis. Use when writing or editing reports, research write-ups, guidance, documentation, summaries, or any prose where clarity and accessibility matter.
user-invokable	true
args	name description required target The document or text to write or rewrite in GOV.UK style (optional) false

PatrickJS

// Types for the result object with discriminated union
type Success<T> = {
  data: T;
  error: null;
};

type Failure<E> = {
  data: null;
  error: E;
};

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#!/usr/bin/env bash

# Inspired from:
# - https://blog.wesleyac.com/posts/simple-deploy-script
# - https://gist.github.com/WesleyAC/b3aaa0292579158ad566c140415c875d
# - https://caddyserver.com/docs/running#using-the-service

set -e
# cd $(dirname $0)

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CULTURE   SPEC.CULTURE  ENGLISH NAME
--------------------------------------------------------------
                        Invariant Language (Invariant Country)
af          af-ZA       Afrikaans
af-ZA       af-ZA       Afrikaans (South Africa)
ar          ar-SA       Arabic
ar-AE       ar-AE       Arabic (U.A.E.)
ar-BH       ar-BH       Arabic (Bahrain)
ar-DZ       ar-DZ       Arabic (Algeria)
ar-EG       ar-EG       Arabic (Egypt)

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// Lists of countries with ISO 3166 codes, presented in various formats.
// Last Updated: July 30, 2020

// If you're using PHP, I suggest checking out:
// https://github.com/thephpleague/iso3166
// or Laravel: https://github.com/squirephp/squire
// 
// JS developers can check out:
// https://www.npmjs.com/package/iso3166-2-db
//

PatrickJS

/*
What happens?
- `new Type().what` is looked up with a call to `get` on the proxy
- a function is returned that will look up `METHOD_NAME` when called
- `METHOD_NAME` is called because of the `()` behind `new Type().what`
- if `METHOD_NAME` exists on you object, your own function is called
- if not, because of prototypal inheritance, `get` is called again
- `name` is now `METHOD_NAME` and we can throw as we know `METHOD_NAME` is not implemented on the type

credits http://soft.vub.ac.be/~tvcutsem/proxies/