With full release will come quite a number of changes and fixes needed to bring Expansion back in full which I don't have a great amount of time to do at the moment (especially as I will finally, eventually, get to playing the game myself) but for the time being, as requested, I'm releasing one of the subclasses provided in this mod for the time being up to 20th level, which is the Bladesinger. Please note, this mod will conflict with any other mod that adds progressions from 13-20 level, such as Unlocl Level Curve, until it is fully setup, sojust load ULC below this mod in the load order.

Wizard: Bladesinging

 

Training in War and Song
When you adopt this tradition at 2nd level, you gain proficiency with light armor, and you gain proficiency with one type of one-handed melee weapon of your choice.
You also gain proficiency in the Performance skill if you don’t already have it.

Note: Works as it would in 5e. If multiclassing from a class that would already have all proficiencies in weapons, there is also an No Proficiency option so you won't get stuck since you otherwise wouldn't have anymore choices available.

Bladesong
Starting at 2nd level, you can invoke an elven magic called the Bladesong, provided that you aren't wearing medium or heavy armor or using a shield. It graces you with supernatural speed, agility, and focus.
You can use a bonus action to start the Bladesong, which lasts for 1 minute. It ends early if you are incapacitated, if you don medium or heavy armor or a shield, or if you use two hands to make an attack with a weapon. You can also dismiss the Bladesong at any time (no action required).
While your Bladesong is active, you gain the following benefits:

• You gain a bonus to your AC equal to your Intelligence modifier (minimum of +1)
  

• Your walking speed increases by 10 feet.
  

• You have advantage on Dexterity (Acrobatics) checks.
  

• You gain a bonus to any Constitution saving throw you make to maintain your concentration on a spell. The bonus equals your Intelligence modifier (minimum of +1).
  

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses of it when you finish a long rest.

Note: This works almost 100% like the source material. The only exceptions were done intentionally, which is cutting out the ability to maintain the Bladesong while making an attack with a weapon using two hands. Because the classic, old school feel of a Bladesinger involved using a longsword, and with BG3's limitations when it comes to forcibly wielding versatile weapons in both hands unless you're wielding something in your off hand, I decided to cut that restriction. This is especially because using a rapier is the most optimal choice (if you're even bothering to attack in melee range).

Extra Attack
Starting at 6th level, you can attack twice, instead of once, whenever you take the Attack action on your turn. Moreover, you can cast one of your cantrips in place of one of those attacks.

Note: Works exactly as it does in 5e (as long as you're using 5e Spells) and should be the most dominant Extra Attack if you happen to obtain any other Extra Attack features from multiclassing.

Song of Defense
Beginning at 10th level, you can direct your magic to absorb damage while your Bladesong is active. When you take damage, you can use your reaction to expend one spell slot and reduce that damage to you by an amount equal to five times the spell slot's level.

Note: Works exactly as it does in 5e and is setup through the reaction/interrupt system.

Song of Victory
Starting at 14th level, you can add your Intelligence modifier (minimum of +1) to the damage of your melee weapon attacks while your Bladesong is active.

Note: Getting to 14th level requires an outside mod that provides progressions for the Wizard class up to 14th level at least.

How to Install

I would recommend installing mods using the BG3 Mod Manager. For those who would want to manually install the mod (for whatever reason), place the .pak file in the \AppData\Local\Larian Studios\Baldur's Gate 3\Mods folder.

Next, update your AppData\Local\Larian Studios\Baldur's Gate 3\Player Profiles\Public\modsettings.lsx file in the following way under the ModOrder section and Mods section (below where GustavDev is):

<?xml version="1.0" encoding="UTF-8"?>
<save>
  <version major="4" minor="0" revision="9" build="331" />
  <region id="ModuleSettings">
    <node id="root">
      <children>
        <node id="ModOrder">
          <children>
            <node id="Module">
              <attribute id="UUID" value="28ac9ce2-2aba-8cda-b3b5-6e922f71b6b8" type="FixedString" />
            </node>
            <node id="Module">
              <attribute id="UUID" value="a2c4b0fc-e745-41df-81b7-fa53950d86a0" type="FixedString" />
            </node>
          </children>
        </node>
        <node id="Mods">
          <children>
            <node id="ModuleShortDesc">
              <attribute id="Folder" value="GustavDev" type="LSString" />
              <attribute id="MD5" value="4f8d917068fbe7ded01b558235dbed96" type="LSString" />
              <attribute id="Name" value="GustavDev" type="LSString" />
              <attribute id="UUID" value="28ac9ce2-2aba-8cda-b3b5-6e922f71b6b8" type="FixedString" />
              <attribute id="Version64" value="144115617576214574" type="int64" />
            </node>
            <node id="ModuleShortDesc">
              <attribute id="Folder" value="Expansion" type="LSString" />
              <attribute id="MD5" value="" type="LSString" />
              <attribute id="Name" value="Expansion" type="LSString" />
              <attribute id="UUID" value="a2c4b0fc-e745-41df-81b7-fa53950d86a0" type="FixedString" />
              <attribute id="Version64" value="36028797018963968" type="int64" />
            </node>
          </children>
        </node>
      </children>
    </node>
  </region>
</save>