Du kan skapa en anpassad PHB-giltig bakgrund för användning i Adventurer League
Från Vanliga frågor :
Can you create a customized background for your character?
Yes, you can customize backgrounds per the rules in the Player’s Handbook, which state that you can pick any two skills and a total of two tool proficiencies or languages. In addition, you can select a feature from any background.You can choose an equipment package from a background or spend gold on gear as normal.
Spelarens handbok ger dessa regler i slutet av avsnittet Bakgrunder (som också visas här i de grundläggande reglerna ):
Customizing a Background
You might want to tweak some of the features of a background so it better fits your character or the campaign setting. To customize a background, you can replace one feature with any other one, choose any two skills, and choose a total of two tool proficiencies or languages from the sample backgrounds. You can either use the equipment package from your background or spend coin on gear as described in chapter 5. (If you spend coin, you can't also take the equipment package suggested for your class.) Finally, choose two personality traits, one ideal, one bond, and one flaw.
If you can't find a feature that matches your desired background, work with your DM to create one.