I have subscribed another version of this mod on the official website, check it if you like here

What IS Gestalt Rule?

Gestalt Rule in DnD terms refers to an optional high-power variant rule that allows players to choose two classes simultaneously when they level up their characters. The details can be seen on this site, but for a brief introduction, let's take a level 5 Fighter / Wizard as an example. Unlike Multiclassing, a gestalt level 5 Fighter / Wizard is still a level 5 character, with proficiency bonus of a level 5 character (+3) instead of level 10, and HP of a level 5 Fighter. He will have access to full repertoire of a level 5 Fighter and level 5 Wizard, including martial weapon proficiency, all armour proficiency, extra attack, effective caster level of 5, able to scribe spells, arcane recovery, etc. Essentially you take all features from two classes and combine their progression into a super class. Feats and Extra Attack from these two classes don't stack with each other, so as a level 5 Fighter / Paladin you still get 1 feat and 1 Extra Attack per round.

What does this mod do?

This mod adds two feats for players to choose from, each of them contain a series of options corresponds to a single subclass in Baldur's Gate 3 (Except for Oathbreaker, the reason for this omission will be mentioned in the "Important Notes" part) and grants all class abilities from level 1 to 12 from this subclass as your character levels up, including saving throw proficiencies, spells, action resources (like channel divinity charges or spell slots), armours/weapons/musical instruments proficiency, metamagic, dialogue options, etc. Other than some minor points which will be mentioned in the 'Important Notes' part, these feats function exactly like a Gestalt Class. You will not get all abilities the moment you take the feat, a level 4 character taking Battle Master option won't get Indomitable or Extra Attack, but the feat will track your character progression, and grants you these abilities at the appropriate levels. Spell slots from different spellcasting classes stack with each other, so as a Sorcerer/Wizard you will get the double amount of spell slots at every level as a normal Wizard.

As a bonus (or penalty I guess), all class abilities that scale with class levels now scale with character levels instead. I might be missing something so you are welcome to provide feedbacks in Bug or Post sections.

Do note that all spells from this mod scales with the casting ability of your base class. It is an intentional choice, to keep spells from other classes useful and avoid redundancy in spellbook UI. If you are not sure which ability it is for your class in BG3, refers to this page.

自1.3.0.0之后，本mod自带中文，无需下载另外的翻译文件。

Important Notes (Read THIS before Download!)

As of 1.2.0.0, this mod dynamically grants abilities to your character, as if they have the gestalt class equal to their character level. However, due to the limitation of my modding abilities and the tools available, you should take notice of these points before downloading this mod.

• Prepared casters have all spells granted to them directly, while spontaneous casters receive a predetermined set of spells chosen by me. This is a limitation that I have to accept to allow the spells to be upcastable. Hopefully it's large enough that you don't severely miss any spell from the class lists. The details of each class are presented in the below.
• All features from this feat only takes effect after a long rest. And whenever you level up your characters, do take a long rest to allow this mod to grant new level features from your gestalt class to you.
• Not every subclass and not every class ability is covered by this mod. Oathbreaker prevents respec so I decide to not include it in this mod. If a character taking paladin feats breaks their oaths, they will not suffer any consequence after they 'choose to become an oathbreaker' or spend 1000g to restore their oath. They will continue as if nothing has happened. Non-bard class taking bard gestalt feat cannot play instrument in place of the somatic elements of a spell.
• HP is not scaled with your feat-chosen class. Your HP is still determined by your main class and class levels.
• The two versions of the feats, Temporal Convergence and Flash of Omniscience, offers the same set of choices, except for Monk abilities. the former gives you monk repertoire, the second without.
  

Installation/Uninstallation

Just use the BG3 mod manager to install it. It can be safely uninstalled once none of your party members have feats from this mod.

Optional File

This optional file allows you mix and match different features from each class. Choose ONLY ONE version!
For example, maybe you are entirely uninterested in features of Hunter besides its level 11 whirlwind / volley attack? Then you can just pick that!
Do note that you need to pick relevant action resources before most of the active abilities can be used.
For example, your spells known will be nothing without daily spell slots, your berserk ability will not function without daily rage charge.
The option with Subclass name is the feature that gives you the class dialogue tag, armour and weapon proficiencies and saving throw proficiencies. 
Meaning you can be a wizard with improved extra attack and whirlwind attack, yet still identify only as a wizard!
Cleric's tag is separate. You need to choose a deity to be recognized as a Cleric.
Same as the other mod, the Monk class with their animations are a sore point, so there are two differently-named but functionally-identical feats, with the only exception that Temporal Convergence gives you all Open Hand Monk features, while Flash of Omniscience do not.
多职业mod的自由选择版本.
你可以随心所欲自由搭配不同的职业特性，所有职业特性都在选项里标明了作用。
名字以子职为命名的选项会给予你该子职的对话选项，豁免和武器、护甲擅长。
除了武僧。
囿于武僧职业的动作tag限制，我将专长分为了两个功能一样，名字不同的专长。唯一的区别是时间收束会给你散打僧所有能力，而全知之影不会给。
中文翻译完全感谢N站上的Eternawn大大😘：
Gestalt Feats CHS And CHT Patch 7 Ready at Baldur's Gate 3 Nexus - Mods and community
不过后续我还是打算负责一点，同时更新中英文mod
现在这个文件也整合了中文翻译

Spells Chosen for Spontaneous Casters

Bard

Level 1: Vicious Mockery, Friends, Light, Minor Illusion, Faerie Fire, Dissonant Whispers, Healing Word, Hideous Laughter
Level 2: Speak with Animals
Level 3: Silence
Level 4: Heat Metal
Level 5: Hypnotic Pattern
Level 6: Glyph of Warding
Level 7: Confusion
Level 8: Freedom of Movement
Level 9: Hold Monster
Level 10: Greater Restoration
Level 11: Irresistable Dance
Level 12: Eyebite

Magical Secrets for Lore Bard

Level 6: Haste, Counterspell
Level 10: Conjure Elemental, Fireball

Magical Secrets for Sword/Valour Bard

Level 10: Counterspell, Banishing Smite

Circle of the Land Druid (In addition to all Druid spells)

Level 3: Mirror Image, Misty Step
Level 5: Hypnotic Pattern, Haste
Level 7: Greater Invisibility
Level 9: Cone of Cold

Eldritch Knight

Level 3: Shocking Grasp, Firebolt, Shield, Magic Missile, Feather Fall
Level 4: Chromatic Orb
Level 7: Misty Step
Level 8: Blur
Level 10: Longstrider, Ray of Frost
Level 11: Darkness

Ranger

Level 2: Ensnaring Strike, Hunter's Mark
Level 3: Speak with Animals
Level 5: Pass without Trace
Level 7: Silence
Level 9: Conjure Barrage
Level 11: Lightning Arrow

Arcane Trickster

Level 3: Mage Hand, Minor Illusion, Firebolt, Disguise Self, Hideous Laughter, Shield
Level 4: Charm Person
Level 7: Invisibility
Level 8: Misty Step
Level 10: Blur, Shocking Grasp
Level 11: Mirror Image

Sorcerer (Draconic and Storm sorcerer will receive additional spells normally)

Level 1: Firebolt, Friends, Light, Ray of Frost, Shocking Grasp, Acid Splash, Shield, Magic Missile
Level 2: Feather Fall
Level 3: Misty Step
Level 4: Hold Person
Level 5: Fireball
Level 6: Counterspell
Level 7: Haste
Level 8: Lightning Bolt
Level 9: Hold Monster
Level 10: Confusion
Level 11: Chain Lightning
Level 12: Globe of Invulnerability

Warlock

Level 1: Eldritch Blast, Friends, Mage Hand, Minor Illusion, Hex, Armour of Agathys
Level 3: Misty Step
Level 4: Hold Monster
Level 5: Hunger of Hadar
Level 8: Banishment
Level 9: Hold Monster
Mystic Arcanum: Eyebite

Fiend

Level 2: Command
Level 7: Fireball
Level 10: Wall of Fire
Level 11: Scorching Ray
Level 12: Flamestrike

Great Old One

Level 2: Dissonant Whispers
Level 7: Slow
Level 10: Black Tentacles
Level 11: Telekinesis
Level 12: Dominate Person

Archfey

Level 2: Faerie Fire
Level 7: Greater Invisibility
Level 10: Dominate Person
Level 11: Calm Emotions
Level 12: Hypnotic Pattern



Compatibility

This mod modifies some of the passives and class abilities in vanilla files to enable character level scaling instead of class level scaling. Other mods modifying these same files will revert the scaling back to vanilla behavior.

Credit

Class Specialization Feats from indecisionincarnate for ideas and the structures of the mod.
Green Ninja757 and Focus from Discord for help with monk animation.
Eternawn的中翻