Unclean killing has a strong connotation.
Unclean means impure, vile, corrupt, or tainted. Killing meaning slaughter, execution, or carnage. These above given words help the reader to understand that he is a monster. These two words are synonymous with the descriptions of the character. Other words in this excerpt that give the same connotation are murder, vengeance, killed, Kin-slaughter. The reader sees this repetition of maleficent words and can piece together by just a few sentences that the character of Grendel is a dark, evil soul.
Hence, the correct answer is Unclean killing
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