According to the Head mourner, "The original aim of the Death Guard was to secure a foothold in the east, in preparation for 'His' arrival. Now though our objective has become a little more...how should I put it...proactive. That fool King think we are here as his ally, we duped him into thinking that Iban was enough of a threat that he let us setup here. Lathas even thinks 'He' will help him dispose of the Kinghts of Camelot. The plague was actually fabricated by King Lathas', to justify the building of the city wall. But it has also worked in our favour too. We help him keep the people of Ardougne believing in the plague, but now after the discovery we have bigger fish to fry here."
The being Temple of Light