From: Some_Character | #033
That's where the other part of the original question comes in. Does it have to be one fierce blow or can you gradually defeat this thing?
Probably either; Covenant did fight with Foul over time and wore him down, and the Ritual of Desecration isn't instant (we know that after it's initiated, there's still enough time for Foul to say "This won't permanently kill me fyi" and laugh at Kevin for sacrificing so much to not even achieve his goal before it finishes them off, being able to do that is the entire reason Foul took part in the ritual in the first place).
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We clasped our hands, our hands in praise of a conquerors right to tyranny