The Legend of Heroes: Trails in the Sky SC - Highway Monster 20 - Fate Spinner (Hard Mode) 

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These guys hit pretty hard but they are pretty weak to Arts. A Final Break from Agate should be enough to do quite a bit of damage, then you can finish them off with any AOE Arts.
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Eiyuu Densetsu: Sora no Kiseki SC
System: PC (Steam)
First Playthrough
Hard Mode
Playlist: • The Legend of Heroes: ...