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Mordor's Champions Unite

ANSWER: CASTLE

Author: Jessica Li

The 6 Lord of the Rings actors here also portrayed characters in the Marvel Cinematic Universe film franchise. Take the index for their MCU characters gives the answer CASTLE.

LOTR character  Actor                 MCU character      Index  Letter
Thranduil       Lee Pace              RONAN THE ACCUSER     10  C
Tauriel         Evangeline Lilly      HOPE VAN DYNE          6  A
Smaug           Benedict Cumberbatch  STEPHEN STRANGE        1  S
Bilbo Baggins   Martin Freeman        EVERETT ROSS           6  T 
Gollum          Andy Serkis           ULYSSES KLAUE          2  L 
Galadriel       Cate Blanchett        HELA                   2  E