Rules FAQ
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The word "cannot" is absolute, and cannot be countermanded by other abilities. That means the restriction of Kingswood Ambush will prevail over cards like Tarle the Thrice-Drowned (TFM) that give you special permission to marshal characters in some way.
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Kingswood Ambush will not prevent marshaling characters as duplicates. Marshaling a duplicate is not considered to be marshaling a card with any of that card's characteristics. It is only considered to be "marshaling a duplicate." While marshaling a duplicate, that card is not subject to restrictions based on the card's printed characteristics, including cardtype, faction, keywords, etc. (See Duplicates.)