No comic?
How far can they get with prep? This is what the time says; Cut off the head, and the body will flounder. Waste not thy time nor thy breath on the Leviathan herd. Point thy blade at the heart of their master, for from him springs all their messages. Leviathan cannot be slain but by the bone of a righteous mortal, washed in the blood of three fallen: a fallen angel, the ruler of fallen humanity, and the father of the fallen beasts.
If that can get that? Otherwise they''ll just have decapitation to stun them without knowing the other two weaknesses.