Creating Custom Backgrounds
1: Choose Abilities
Choose three abilities that seem appropriate for the background:
Strength or Dexterity. These abilities are ideal for a background involving physical exertion.
Constitution. This ability is ideal for a background that involves endurance or long hours of activity.
Intelligence or Wisdom. One or both abilities are ideal for a background that focuses on cerebral or spiritual matters.
Charisma. This ability is ideal for a background that involves performance or social interaction.
2: Choose a Feat
Choose one feat from the Origin category. See the Player’s Handbook for examples of Origin feats.
3: Choose Skill Proficiencies
Choose two skills appropriate for the background. There needn’t be a relationship between the skill proficiencies a background grants and the ability scores it increases.
4: Choose a Tool Proficiency
Choose one tool used in the practice of the background or often associated with it.
5: Choose Equipment
Assemble a package of equipment worth 50 GP (including unspent gold). Don’t include Martial weapons or armor, as characters get them from their class choices.
Using Backgrounds and Species from older books
Backgrounds in older D&D books don’t include ability score adjustments. If you’re using a background from an older book, adjust your ability scores by increasing one score by 2 and a different one by 1, or increase three scores by 1. None of these increases can raise a score above 20.
Similarly, species in older books include ability score increases. If you’re using a species from an older book, ignore those increases and use only the ones given by your background.
Also, if the background you choose doesn’t provide a feat, you gain an Origin feat of your choice.