
Your questing experience has allowed you to develop a particular style of adventuring. As a result, you learn one Adventuring Style option of your choice from the Adventurer archetype. If you already have a style, the one you choose must be different. Your spellcasting ability for the style is Intelligence, Wisdom, or Charisma (choose when you select this feat).
Whenever you reach a level that grants the Ability Score Improvement feature, you can replace this feat’s adventuring style with another one from the Adventurer archetype that you don’t have.

DnDBeyond Links (Features fully integrated)
Adventurer Subclass: Artificer, Barbarian, Bard, Blood Hunter, Cleric, Druid, Fighter, Monk, Paladin, Ranger, Rogue, Sorcerer, Warlock, Wizard
Feats: Adventurer, Adventuring Initiate
Magic Items: Excalibur, Holy Grail, Horn of Heimdall, Philosopher's Stone
The Adventurer is a universal subclass, which means that any class (official or homebrewed) can take it as long as the class follows conventional leveling. It was inspired by the Strixhaven UA, which included shared subclasses, too, but not to the same extent here. The features and 50+ adventuring styles aim to support less conventional playstyles and add utility to characters. It was built upon the first iteration of this subclass, the Adventurer fighter subclass, which was built upon the initial Adventurer feature. Oh how it has grown!
In the compendium, there are feats included to allow a player to dip into the Adventurer's flavor in addition to classic magic items that players can quest for.
Everything created here is available on DnDBeyond with fully integrated (and quality assured!) features. Well, it's more like 99% integrated, since there are limits to DDB's capabilities. On DDB, I made it so that spellcasters have access to the spell lists by default and they can choose to take Improvised Spellcasting if they want to by utilizing the optional features function of the character builder.
I'm happy with how this compendium turned out. I've taken a lot of time to polish it and translate it into DDB. A lot of time. Too much time. Hopefully someone finds good use of it. Enjoy!