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All answers having "Sanctuaries" as clue:

3 Character Answers:

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EMS



4 Character Answers:

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DENS



5 Character Answers:

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ASYLA

LAIRS

OASES



6 Character Answers:

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HAVENS

HOLIES



7 Character Answers:

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ASYLUMS

SHRINES



9 Character Answers:

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SAFEZONES