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All answers having "Mythical monster" as clue:

3 Character Answers:

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ORC

RHO



4 Character Answers:

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OGRE

YETI



5 Character Answers:

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HARPY

LAMIA

TROLL



6 Character Answers:

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AFREET

DRAGON

TYPHON



7 Character Answers:

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CHIMERA



10 Character Answers:

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HIPPOGRIFF