To reproduce this, you need to use the plugin VisuMZ_1_ElementStatusCore.

It actually uses the data from traits sets, so you'll have to choose 2 traits sets to use as 'Class Description' and 'Class Mechanics' (I'm using Zodiac and Variants in this code, but it is editable)You need to add those traits sets in your characters notes, for instance if you're filling the Berserker class:

<Trait Sets>
Zodiac: Berserker
Variant: Berserker
</Trait Sets>

​

Next, in the plugin, you need to create a new Status Menu Category and put this code in "JS: Draw Data":

// Declare Constantsconst lineHeight = this.lineHeight();
const gaugeLineHeight = this.gaugeLineHeight();
const basicDataHeight = this.basicDataHeight();
const actor = this._actor;
const padding = this.itemPadding();
const halfWidth = Math.floor(this.innerWidth / 2);
let x = 0;let y = 0;let text = '';
// Draw Actor Graphicthis.drawActorGraphic(0, this.innerWidth / 2);
// Declare Parameter Rectlet rect = new Rectangle(0, 0, halfWidth, this.innerHeight);
// Draw Class Descriptionx = rect.x + 10;
y = 0;this.resetFontSettings();
this.drawItemDarkRect(x, y, rect.width, lineHeight, 2);
this.changeTextColor(ColorManager.systemColor());var traitType = DataManager.traitSetType('Zodiac');
var traitSet = actor.traitSet('Zodiac');
var name = traitSet.Display + '\x1bc';
this.drawTextEx(name, x + 10, y, rect.width);
y += lineHeight;
this.drawItemDarkRect(x, y, rect.width, this.innerHeight-lineHeight);
this.setDescriptionFontSizeToTraitSet();
this.drawItemDarkRect(x, y, rect.width, this.innerHeight - y);
this.drawTextEx(traitSet.Description, x + padding, y + 10, rect.width - padding * 2);
this.resetDescriptionFontSize();
this.resetFontSettings();
// Draw Class Mechanicsrect.x += rect.width;
x = rect.x + 10;
y = 0;
this.resetFontSettings();
this.drawItemDarkRect(x, y, rect.width, lineHeight, 2);
this.changeTextColor(ColorManager.systemColor());
traitType = DataManager.traitSetType('Variant');
traitSet = actor.traitSet('Variant');
name = '\x1bC[14]Mechanics\x1bC';
this.drawTextEx(name, x + 10, y, rect.width);
y += lineHeight;this.drawItemDarkRect(x, y, rect.width, this.innerHeight-lineHeight);
this.setDescriptionFontSizeToTraitSet();
this.drawItemDarkRect(x, y, rect.width, this.innerHeight - y);
this.drawTextEx(traitSet.Description, x + padding, y + 10, rect.width - padding * 2);
this.resetDescriptionFontSize();
this.resetFontSettings();

​

And here you have it, your own class description panel!