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All answers having "Ruins" as clue:

5 Character Answers:

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ASHES

BANES



6 Character Answers:

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BLASTS

DEBRIS

DOESIN

GUMSUP

LOUSES

QUEERS

RELICS

SPOILS

TAINTS

UNDOES

WRACKS

WRECKS



7 Character Answers:

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RAVAGES



8 Character Answers:

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DESTROYS

TRAMPLES

WRECKAGE