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One-Armed Master

Not only aren't you ambidextrous, you're pretty uncoordinated with anything that takes more than 1 hand. But your gifted good arm has always been more than enough on its own, so that hasn't really held you back.

Type: Background

Requirements: 1st level background feat

Required for: None

Specifics: Character gains +5 bonus to Attack Bonus when unarmed or using one-handed, light, and throwing weapons, but suffers a -10 penalty to Attack Bonus when using two-handed weapons. Beyond that, you cant use dual-wielding.

Use: Automatic