Cancer is one of the twelve Zodiac Stones Defeating Construct 7 nets the party the Cancer
Stone, which can then be used by Beowulf Kadmas to restore his love Reis Dular to her human form.
Cancer is also a Zodiac sign used to determine damage compatibility between characters during battle. Cancer has optimal compatibility with sometimes a Capricorn, and Libra, good compatibility with Scorpio and Pisces, and bad compatibility with Sagittarius and Aries.