Yao introduces the Dark Elves who volunter to accompany Itamy to fight the Flame Dragon. From http://www.taadd.com/chapter/GateJietaiKarenoChiniteKakuTatakeri43/536353-20.html
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Chapter 43 Gate - Thus the JSDF Fought There chapter title [Preparing to attack the Dragon...
The Dark Elves Joining Itami to fight the Flame Dragon are named on the manga page on the right...