Biohazard
Difficulty Level: Medium, members only
Reward: 3 Quest Points, King Lathas amulet, some thieving experience(1250 at level 43 thieving), and permission to use the king�s combat training area.
Quests Needed: Must have completed the Plague City quest to begin.
Start location: Talk to Elena in the house east of her parents house, and closest to the northern wall of Ardougne.
Elena: She will tell you to talk to Jerico, who you will find in the building north of the chapel on the other side of the river, 2 buildings above the Adventurer�s Supplies shop.
Jerico: He tells you to talk to Omart. You can find Omart directly south of the doors that open into East Ardougne. Before you go to him though, go out to Jerico�s backyard and take a cage of messenger pigeons. Then go back inside and search the cupboard for pigeon feed.
Omart: He tells you about his associate, Kilron, and their plan to get into East Ardougne. But in order to complete it you need to distract the guard tower with the pigeons. The tower is located just north of the entrance to East Ardougne. Use pigeon feed with Guard Tower then release the pigeons and go back and talk to Omart. He will help you over the wall.
Once over the wall: Go to the north-eastern corner of East Ardougne and talk to one of the mourners outside the building. Tell him to have a good meal then go north-west to the side of the Rehison house and pick up the rotten apples. Then go east to the side of the mourner�s house, climbover the fence and use the rotten apples with the cooking pot. Go out front and talk to the mourner. He says that they are sick and need a doctor. Go to the building directly southwest of Bravek�s office and search the cupboard. Take the gown and talk to thenurse Sarah.
Wearing Gown: Talk to mourner and go through the door to the mourner�s house. Go upstairs and kill the level 16 mourner. Use the bronze keyhe dropped on the gate and search the crates. Find the distillator and return to Kilron. Go back over the wall and return to Elena.
Elena: She thanks you for the distillator and gives you the vials and plague test. Take the vials to the Chemist, whose house is located west of Rimmington. Don't teleport or fight!
Chemist: Say �It�s ok I�m Elena�s friend.� Then give the people outside the vials in this order: Chansy - Liquid Honey. Hops - Sulphuric broline.DiVinci - Ethanea. Then go to the little fenced-in area in the south-east corner of Varrock.
Guidor�s Wife: Talk to her and then go to the Tailor in the northern building and buy a full priest gown (12 gp).
Bar: Then go to the bar and talk to all three people, besides the bartender, to receive all the vials. (Chansy, DeVinci, and Hops)
Guidor�s House: Finally go back to Guidor�s house and talk to his wife again. Go into his room and tell him that you are the plague carrier and you�ve come from Elena. He tells you there is no plague.
Elena: Return to Elena and tell her what Guidor told you. She tells you that the king will surely reward you. Go speak to King Lathas inthe castle to the South.
King Lathas: Talk to him and say �I don�t understand�� and he tells you why the plague is a hoax, and gives you your reward.
(rs2 ok)
Source: RSDemon Online,RSDemon Community