how many units must you have lost to access the optional chapters in Fire Emblem: Shadow Dragon?
Solution 1:
Based on the wiki list of chapters, there a total of 5 chapters that can only accessed based on the available units. These chapters are noted as "Chapter NX"
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Chapter 6x
To advance to this chapter, the number of alive units must be 15 or less by the end of Chapter 6.
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Chapter 12x
To gain access to this chapter, complete Chapter 12: The Ageless Palace with 15 units or less.
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Chapter 17x
To gain access to this chapter, finish Chapter 17 with 15 units or fewer alive.
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Chapter 20x
To advance to this chapter, complete Chapter 20: Camus the Sable with 15 or fewer units alive
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Chapter 24x
If you want to advance to this Gaiden Chapter you must have Tiki dead (or not recruited) and the Falchion not in possession by the end of chapter 24