It was said that over half those sent down in the Catacombs never came back, some fell victim to the undead and others were eviscerated by the traps that guards the ancient tombs down below. In death, there's no evil nor there's no good, the justice of the graveyard, all are equal even the Divine who rose and earned lordship over the laws that held together the earth will eventually rust and fade as every cell in their body turns into nothing but soft sands that drift through the winds of time itself.
The tainted marks of the guild represent the actual areas that they all have gone so far, its uncertain how long the very distance between points go and perhaps it is up to the knight himself to find the answer, this was for the guild and for Lord Harrigan himself.