Grim Dawn has been updated. Caution: Wall of text.

Patch 1.0.0.4 (07th June 2016)

Please Note: Due to archive changes in preparation for future content updates, this patch is much larger than usual. Users with strict ISP download limits may want to review their usage before proceeding.
Major New Features
New Content: The Hidden Path. Venture down the elusive route taken by the followers of the Witch Gods and discover the secrets known only to their most loyal servants. Your journey begins near Lower Crossing, but requires some Dynamite.
The Hidden Path includes a wealth of new lore, 5 new bosses, a new dungeon, 3 new Monster Infrequents and 7 new Unique items.
The digital copy of the world map is now included in the DLC folder for those with the respective DLC code. On Steam, you can right-click the game in your Library, select Properties, Local Files and Browse Local Files. You may have to start the game once for the map to download.

Mod Tools
Note: due to changes to GameEngine.dbr, modders who edited this file should update it in their mod to account for the new loot randomizer tables.
GameEngine.dbr edits in a mod will now properly override the default gameengine.dbr values when the mod is loaded under Custom Game
Exporter (.dlo) files are now available in the installation directory for 32-bit versions of 3ds Max 2009, 2011 and 2012
Flipped the condition logic for isDifficulty and LuaScript Quest and Conversation conditions so that they make more intuitive sense based on what the editors are displaying to the user (ex. LuaScript Test() < 7 now checks if the function returns a value less than 7, previously it would check if 7 is less than the returned value, similarly isDifficulty >= Epic used to check if Epic was >= to the current difficulty, now it checks if the current difficulty is Epic or greater)
Maximum number of masteries increased from 10 to 30.
Maximum terrain size in editor reduced from 256x256 to 128x128. Existing large terrains should be unaffected.
Fixed a bug where skills would not load correctly in mods.

Art

Male PC has undergone foot surgery, resulting in slightly smaller boot sizes.

Tech

Fixed radial critical WeaponPool skills activating their own damage on non critical attacks.
Fixed ChargedFinale WeaponPool skills using up twice as much energy as intended.
Skill Modifier tooltips now include their base skill offensive modifiers in their calculated damage.
Fixed dialog popups not scaling properly with UI scale.
Fixed a bug where feared monsters would flee incorrectly.

Game
Improved the ability for multiple pets to engage Bosses, Heroes and Nemesis Bosses.
Increased the drop rate of Ectoplasm, Chipped Claws and Kilrian's Shattered Soul
Reduced boss and hero resistance to Life Leech effects
Reduced Damage over Time effects applied by monsters on Elite/Ultimate difficulty
Reduced Leech Resistance on Obsidian Defilers to 100%, so that it is susceptible to resist reduction
The Something for Nothing and Flesh and Iron quests have been redesigned
Removed, or added additional spawn locations to, static Treasure Trove locations that were missed in 1.0.0.2
% Total Damage multiplier now only affects damage stats and no longer modifies non-damage effects such as % Damage Converted to Health, % Resistance Reduction, Armor Reduction, etc.
Reduced the burst potential of certain poison abilities used by heroes and bosses (ex. Gastris, the Foul)

Itemization
Rare item drop rates now scale better with difficulty, for a more rewarding experience when playing on Elite and Ultimate difficulty.
Increased the drop rate of Unique items on Ultimate difficulty from non-Nemesis sources
Improved the base attributes of all rare Monster Infrequents
Significantly increased the affix-roll quality of Monster Infrequents
Increased the drop rate of Monster Infrequents from all sources
Cronley's Gang nemesis now has the same loot table as the Kymon's Chosen and Order of Death's Vigil nemesis bosses, as he is relatively easier to hunt down as well.
A balance pass has been done on Faction Augments. Generally, the goal was to increase the appeal of some of the more lackluster damage-focused options and provide more viable options on Ultimate difficulty. With a select few exceptions, this is an all around buff to Augments.
Added a Blacksmith to Fort Ikon with the same bonuses as the Homestead smith (including the Dynamite blueprint)
Etram Fald now crafts belts when creating random Legendary Armor only, previously belts were also possible when crafting a random Accessory. In Addition, the tooltips for the blueprints now clarify that they will generate an Epic item if the character is below level 50 (58 for accessories).
Rare Affixes - Added 2 new Rare Prefixes and 2 new Rare Suffixes for armor, focused on pet builds
Rare Prefix - Cutthroat: added Pierce Resist at level 54+
Rare Prefix - Merciless: added Poison Resist at level 54+
Rare Prefix - Plaguebearer: reduced Resist Reduction
Rare Prefix - Deathdealer: renamed to Sorcerer, to match the class combo name
Rare Prefix - Nightstalker: renamed to Spellbreaker, to match the class combo name
Rare Suffix - Abyss: reduced Resist Reduction
Rare Suffix - Rapid Reflexes: updated the lower than intended Attack Speed bonus
Rare Suffix - Shadows: added Vitality Resist at level 49+
Magic Suffix - of the Wastes: reduced Resist Reduction
Epic - Legplates of Valor: reduced health on the regular and Empowered versions
Legendary - Agony: reduced Poison Resist Reduction on the proc to -20%
Legendary - Beronath, Reforged: increased % All damage, increased Offensive Ability to 40
Legendary - Golemborn Greaves: Internal Trauma Retaliation from the skill is now dealt over 5s, retaliation damage per second slightly reduced
Legendary - Justicar Set: this set has been redesigned. Set bonuses updated.
Legendary - Chestguard of Justice: added % Fire damage and 16% Chaos resist, replaced bonuses to Veterancy and Squad Tactics with +2 to Rending Force and +2 to Internal Trauma
Legendary - Faceguard of Justice: passive bonus now works with melee weapons, rather than just shields, reduced its flat damage bonus but added % Physical and % Fire damage. Replaced bonus to War Cry with +2 to Forcewave.
Legendary - Handguards of Justice: added Fire damage, % Attack Speed and % Cast Speed, removed % Shield Damage Blocked and % Block Chance. Replaced bonus to Blindside with +2 to Forcewave.
Legendary - Iskandra's Unity Set: increased cooldown on Iskandra's Defense to 16s
Legendary - Shoulderguard of Justice: added % Fire and % Physical damage, replaced bonuses to Scars of Battle and Break Morale with +2 to Rending Force and +2 to Blindside. Passive bonus now works with melee weapons, rather than just shields.
Legendary - Markovian's Fortress Set: replaced 50% Constitution bonus with 20-45 Physical damage
Legendary - Markovian's Distinction: added flat Physical damage
Legendary - Stormheart: reduced % Attack Speed to 4% and Offensive Ability to 32
Legendary - The Deathmark Set: fixed an issue with Reaper's Mark not casting in a radius around the target point
Legendary - The Harbinger Set: the skill granted by the 3-piece bonus now triggers at 50% health and also grants 500% Chaos damage while active, cooldown reduced to 40s, duration increased to 8s. Replaced bonus to Vulnerability with +3 to Doombolt.
Legendary - Harbinger of Eternal Suffering: increased damage on skill, added +2 to Doombolt and 8% Cooldown Reduction
Legendary - Mask of the Harbinger: the passive skill now also grants 10% Cooldown Reduction
Legendary - The Sacred Balance Set: Shadowbolt proc now also has 20% Life Steal, increased % Weapon damage on The Sacred Balance proc to 45%
Legendary - Valdun's Treachery Set: increased Pierce damage bonus, increased proc rate of the skill to 20% and the % Weapon damage to 110%
Legendary - Valdun's Bounty: increased Radius to 3 and % Weapon damage to 115% on the granted skill, Valdun's Treachery
Legendary - Valdun's Rifle: reduced cooldown to 2.5s and increased the % Weapon damage to 320% on the granted skill, Perforator Round
Legendary - Wildblood Vanguard Set: increased % Vitality and % Bleed damage from the skill proc Wildblood to 400%, but increased the cooldown to 15s
Added small cooldowns to various on Attack and on Crit effects on items that previously had none. Procs that deal damage over time were generally unaffected by this.
Slight adjustment to % Weapon damage values on various Legendary item skills and procs
Lifestealer Oil: reduced % Damage Converted to Health to 15%
Reduced % Weapon damage on Troll Rage and Beronath's Fury to 122%. These skills serve as a good way to apply another Celestial Power for builds that do not take an auto-attack replacer, but the skill points they free up made them a bit too favorable, particularly for builds that already perform very well.
Component - Aethersteel Bolts: reduced Resist Reduction applied by Aether Tendril to 15, but increased its damage dealt.
Component - Blessed Steel: reduced Resist Reduction on Sacred Strike to 18
Component - Mark of Dreeg: reduced Resist Reduction to 10
Component - Symbol of Solael: reduced Resist Reduction on the granted skill to 15%. Increased the target radius, Chaos damage and energy cost.
Component - Venom-Tipped Ammo: reduced Resist Reduction on the granted skill to 12
Relic - Belgothian's Carnage: increased cooldown on proc to 4.5s
Relic - Corruption: reduced Elemental Resist Reduction to -15%
Relic - Haunt: reduced Aether/Vitality Resist Reduction to -15%
Relic - Iskandra's Balance: increased % Fire/Cold damage on the skill proc, Elemental Imbalance, to 400%. Added 24-32 Fire damage, 24-32 Cold damage and 30% Crit damage to the proc.
Relic - Malediction: reduced chance of Resist Reduction to 15
Relic - Necrosis: reduced Resist Reduction to -18%
Relic - Reckoning: reduced Physical Resist Reduction to -20%
Relic - Terror: reduced Total Resistance Reduction to 10%

To be continued...