The angle at which the faces meet is important because a larger angle results in a duller blade while strengthening the edge. A stronger edge is less likely to dull due to fracture or to roll out of shape. Frost then subdues Blade and transports him to the Temple of Eternal Night, where he plans to perform the summoning ritual for La Magra. Karen is thrown into a pit to be devoured by Webb, who has mutated into a zombie-like creature.
Karen injures Webb before fleeing. This creates a conflict between the intended use of the Blade Market, the material from which it is to be made, and any manufacturing processes (such as heat treatment in the case of steel blades, which affects the hardness and toughness of the blade). A balance must be struck between sharpness and durability. Differential hardening is one method for getting around this. This method produces an edge that retains its sharpness as well as a tough body.
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