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Take your first Sorcerer level with the Shadow Magic origin no later than 5th level. Start with one to four Rogue levels, choosing the Swashbuckler archetype or any archetype if you have the Mobile feat.
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Variant Human with Mobile and Wood Elf are both great choices. Up to you, but I recommend something with a higher base speed than 30 feet or plans to get it early. Wisdom - Great skills and important saving throws.I would personally recommend Constitution since there are a large number of useful Sorcerer spells with no scaling, and concentration based buffs will be your bread and butter.
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Charisma will make you better with social encounters and offers more variety in effective spells to choose, while Constitution grants better survivability and concentration.
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