Possible Clues:

• Beowulf foe
• Mythical half-human water monster killed by Beowulf
• Beowulf's first combatant
• Beast of an epic poem
• Foe of Beowulf
• Cain descendant, per ancient literature
• Monster slain by 1 ac
• Beowulf's foe
• Beowulf's victim
• Monster defeated by Beowulf