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NOTES.md

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The following is a list of of observations of my own as I test the editor on D2R patch 2.7, either completing some information here and there or adding things that have been changed since D2R.

Attributes

Saved is col 7 CSvSigned is col 8 CSvBits# is col 9

Stat ID Saved Signed Bits
Strength 0 1 0 10
Energy 1 1 0 10
Dexterity 2 1 0 10
Vitality 3 1 0 10
Stat Points Left 4 1 0 10
Skill Points Left 5 1 0 8
Hit Points (Current) 6 1 0 21
Hit Points (Max) 7 1 0 21
Mana (Current) 8 1 0 21
Mana (Max) 9 1 0 21
Stamina (Current) 10 1 0 21
Stamina (Max) 11 1 0 21
Level 12 1 0 7
Experience 13 1 0 32
Gold (Inventory) 14 1 0 25
Gold (Stash) 15 1 0 25

Character

The name now appears to fill 48 bytes. The names are still limited to 15 graphemes, but not 15 bytes. E.g using japanese kana that each take up 3 bytes, you may fill up 45 bytes of the name section. You can't mix and match languages, てすと　is valid but てtoす is not.

Setting the act/difficulty bytes in the Character section to e.g Hell on a fresh level 1 character won't allow them to enter Hell if they haven't unlocked it. However, setting the act will allow you to access an act you haven't unlocked yet within the same difficulty.

Loading a single player file with "Ladder" bit set to 1 in Character Status does nothing (duh).

The character level shown in the menu preview is the from the attributes section, but in-game it gets overridden by the level in character section.

Assigned skills have a default value of 0xFF 0xFF 0x00 0x00 before they are set (65535 in lower endian).

Legacy Character Menu Appearance

32 bytes starting at offset 136.

Default value is 0xFF.

Byte 141: Weapon

Some codes gleaned from testing:

  • 04: Hand Axe
  • 09: Wand
  • 0D: Morning Star
  • 0F: Flail
  • 12: Sabre/Scimitar
  • 13: Falchion
  • 14: Crystal Sword
  • 15: Broad Sword
  • 1B: Short Spear/Knife

Bytes 137..141 and 144..146: Armor

As far as I can tell, bytes 137..141 encode the visuals of the body armor, and 144..145 decide the shoulderpads.

Good resource: http://paul.siramy.free.fr/_divers2/Extracting%20Diablo%20II%20Animations.pdf (Page 11)

Bytes 144..145 could be S1 and S2, and 137..141 obviously contain TR and probably RA and LA. More testing needed.

Mercenary

Starts at offset 177

Mercenary ID

Offset 179, 4 bytes

Appears to be 0 if you have never hired a merc, otherwise randomly generated. Can be edited with seemingly no impact.

Mercenary Name

Appears unchanged from the list at http://user.xmission.com/~trevin/DiabloIIv1.09_Mercenaries.html except for a typo, the first Barbarian name should be Vardakha.

Mercenary Variant

# Code Difficulty Act Variant
0 00 00 Normal A1 Fire
1 01 00 Normal A1 Cold
2 02 00 Nightmare A1 Fire
3 03 00 Nightmare A1 Cold
4 04 00 Hell A1 Fire
5 05 00 Hell A1 Cold
6 06 00 Normal A2 Prayer
7 07 00 Normal A2 Defiance
8 08 00 Normal A2 Blessed Aim
9 09 00 Nightmare A2 Thorns
10 0A 00 Nightmare A2 Holy Freeze
11 0B 00 Nightmare A2 Might
12 0C 00 Hell A2 Prayer
13 0D 00 Hell A2 Defiance
14 0E 00 Hell A2 Blessed Aim
15 0F 00 Normal A3 Fire
16 10 00 Normal A3 Cold
17 11 00 Normal A3 Lightning
18 12 00 Nightmare A3 Fire
19 13 00 Nightmare A3 Cold
20 14 00 Nightmare A3 Lightning
21 15 00 Hell A3 Fire
22 16 00 Hell A3 Cold
23 17 00 Hell A3 Lightning
24 18 00 Normal A5 Bash
25 19 00 Normal A5 Bash
26 1A 00 Nightmare A5 Bash
27 1B 00 Nightmare A5 Bash
28 1C 00 Hell A5 Bash
29 1D 00 Hell A5 Bash
30 1E 00 Nightmare A2 Prayer
31 1F 00 Nightmare A2 Defiance
32 20 00 Nightmare A2 Blessed Aim
33 21 00 Hell A2 Thorns
34 22 00 Hell A2 Holy Freeze
35 23 00 Hell A2 Might
36 24 00 Normal A5 Frenzy
37 25 00 Nightmare A5 Frenzy
38 26 00 Hell A5 Frenzy

The codes have not been changed since 1.09: http://user.xmission.com/~trevin/DiabloIIv1.09_Mercenaries.html#code

Instead, the new codes added with patch 2.4 of D2R (Nightmare A2 mercs with Prayer/Defiance/Blessed Aim, Hell A2 mercs with Thorns/Holy Freeze/ Might, and Frenzy Barbarians) have been appended to the table.

This also explains why Qual-Kehk usually has more Bash barbs than Frenzy: the two old codes per difficulty still mean bash, whereas there is only one of the new frenzy code per difficulty.

Mercenaries require different amounts of XP to get to a certain level, depending on both their type and the last difficulty beaten by the character they were recruited by.

Mercenary Type Variant XP Rate (Normal) XP Rate (Nightmare) XP Rate (Hell)
A1 Fire 100 110 120
A1 Cold 105 115 125
A2 All 110 120 130
A3 Fire 110 120 130
A3 Lightning 110 120 130
A3 Cold 120 130 140
A5 All 120 130 140

The formula to calculate experience based on level and XP Rate is as follows: $XP Rate * (Level + 1) * (Level^2)$

Inversely, getting the mercenary level based on current experience and XP Rate requires solving the following cubic polynomial:

$(level + 1)(level^2) = \dfrac{Experience}{XP Rate}$, or using $x$ for $level$: $x³ + x² = \dfrac{Experience}{XP Rate}$

Since x > 0 (the possible values for levels are 1-98), we know that $x^3 < x^3 + x^2 < (x+1)^3$ .

Therefore, $\sqrt[3]{x^3} < \sqrt[3]{x^3 + x^2} < \sqrt[3]{(x + 1)^3}$ or more simply $x < \sqrt[3]{x^3 + x^2} < x + 1$.

Since we know $x^3 + x^2 = \dfrac{Experience}{XP Rate}$, we get the final expression: $Level < \sqrt[3]{ \dfrac{Experience}{XP Rate}} < Level + 1$

A possible candidate for $x$ is the floor of the cubic root of our experience/xp rate, $s = \lfloor\sqrt[3]{\dfrac{Experience}{XP Rate}}\rfloor$ . However, it is possible that $s^2 + s^3 > \dfrac{Experience}{XP Rate}$. In that case, we need to take $s - 1$.

The final algorithm is as follows:

Let s = floor((experience/xp_rate)**1/3)
if experience/xp_rate < s^3 + s^2:
    return s - 1
else:
    return s

Example:

A2 Hell mercenary with 99040759 XP.

experience/xp_rate = 99040759/130 = 761851.992308
s = floor(761851.992308^(1/3)) = 91
91^3 + 91^2 = 761852
experience/xp_rate < 761852, therefore level = s - 1 = 90

Quests

The data for every quest is held in 2 bytes. The quests structure contains 8 quests for every act except act 5, which has a different structure and padding at the end.

The first "quest" is the prologue to a new act, then come 6*2 bytes for every quest (3 in act 4 + 3 unused), and a completion quest.

The prologue and completion quest only ever take a single flag, QFLAG_REWARDGRANTED, to signal true/false, which is also bit 0, so you can effectively treat them as 0/1.

The prologue controls whether your character has been introduced to a given act, e.g has spoken to Warriv in Act I. The completion quest controls whether your character can use the waypoint to the next act, except for Act IV which requires you instead to have beaten Q2 (Terror's End).

Warning: There are differences between the order the quests are stored in the same order and the order they appear in the game for Act I, III and IV. Refer to this table when editing quests.

Act I

Quest Number Quest Name Quest Number in game
1 Den of Evil 1
2 Sisters' Burial Grounds 2
3 Tools of the Trade 5
4 The Search For Cain 3
5 The Forgotten Tower 4
6 Sisters to the Slaughter 6

Act III

Quest Number Quest Name Quest Number in game
1 Lam Esen's Tome 4
2 Khalim's Will 3
3 Blade of the old Religion 2
4 The Golden Bird 1
5 The Blackened Temple 5
6 The Guardian 6

Act IV

Quest Number Quest Name Quest Number in game
1 The Fallen Angel 1
2 Terror's End 3
3 Hell's Forge 2

Some of the flags are constant, others depend on the quest.

Here is the list, from D2MOO.

Note: The names are straight from D2MOO and may be changed yet.

Flag Bit
QFLAG_REWARDGRANTED 0
QFLAG_REWARDPENDING 1
QFLAG_STARTED 2
QFLAG_LEAVETOWN 3
QFLAG_ENTERAREA 4
QFLAG_CUSTOM1 5
QFLAG_CUSTOM2 6
QFLAG_CUSTOM3 7
QFLAG_CUSTOM4 8
QFLAG_CUSTOM5 9
QFLAG_CUSTOM6 10
QFLAG_CUSTOM7 11
QFLAG_UPDATEQUESTLOG 12
QFLAG_PRIMARYGOALDONE 13
QFLAG_COMPLETEDNOW 14
QFLAG_COMPLETEDBEFORE 15

Example of some stages of Den of Evil:

Quest Stage Bytes Binary Flags Set
Quest not started 0x00 0x00 0000 0000 0000 0000 None
Quest started (Talked to Akara) 0x04 0x00 0000 0000 0000 0100 QFLAG_STARTED
Cleared Den of Evil (Return to Akara for reward) 0x1C 0x00 0000 0000 0001 1100 QFLAG_STARTED QFLAG_LEAVETOWN QFLAG_ENTERAREA
Talked to Akara (Completed quest) 0x01 0x30 0011 0000 0000 0001 QFLAG_REWARDGRANTED QFLAG_UPDATEQUESTLOG QFLAG_PRIMARYGOALDONE

Akara reset (offset 82 out of 96) seems to be set to 2 if unlocked but not used, and to 1 if used.

Waypoints

A new character will have three waypoints unlocked by default: Rogue encampment in normal, nightmare and hell.