Hakaiou is a Raven that appears in the Armored Core: Master of Arena Extra Arena. He is a member of the Guest Arena.
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An enhanced model of the AC that won the Editor's Battle Competition. Once caught, you won't escape.
AC Black Dragon[]
Black Dragon is a heavyweight four-legged AC equipped with a grenade launcher on both shoulders, a machine gun and quite possibly a laser blade. He can launch into battle overweight.