According to the novel Grendel, all monsters, including Grendel himself, descend from Cain
She gave Beowulf Grendels claw.
Grendel's weakness in the Anglo-Saxon epic Beowulf is his vulnerability to weapons, particularly the sword that Beowulf uses to defeat him. Due to a curse placed on Grendel's ancestor Cain, he is unable to be harmed by conventional weapons made by men.
A swamp
1
he dies later on
Underwater, in a lake.
you mean hangs grendels hand if so than because to show that he can kill Grendel you mean hangs grendels hand if so than because to show that he can kill Grendel
God's Power
To steal back Grendels arm
the word spread by worriers who escaped.
The Sword breaks
Under water, where Grendel's mother lived.