34mm Fingerboard Deck
 
If you read the Bible Story it is not ever really stated how Cain killed Abel, so took a little creative license, what do you think? Rock.. Knife... Spear... Bare Hands... 
Genesis 4:8
8 Now Cain said to his brother Abel, “Let’s go out to the field.”[d] While they were in the field, Cain attacked his brother Abel and killed him.