Old School RuneScape Wiki


15,855pages on
this wiki
Add New Page
Add New Page Discuss5

RuneScape 3 icon

Instruction manual
This quest has a quick guide found here.
It briefly summarises the steps needed to complete the quest.


Old School RuneScape uses the British convention for floor numbering: Ground floor, first floor, etc.
Biohazard (#38)
Please add an image!
Members only? Yes
Release date 23 October 2002 (Update)
Quest series Elf
Official difficulty Novice
Official length Long
Developer Tom W
[view] [talk]

Biohazard continues the storyline after the Plague City quest. The plot deepens as Elena finally gets a chance to process her plague samples. Buried under these samples lies a well-hidden secret.


Start point Quest Talk to Elena in her house in East Ardougne. She lives right across the road from where you started Plague City.
Official difficulty Novice
Description This is the second part of an ongoing adventure. Help Elena discover the truth about the infamous Ardougne plague.

Smuggle test samples across Ardougne to Elena's old mentor.

Length Long


Items required


Enemies to defeat Mourner (level 13)



Items required: None.

Elena location

Elena's location.

Jerico location

Jerico's house with pigeon cages and bird food.

To begin, talk to Elena in East Ardougne, directly west of the shortcut log. She suggests talking to her father's friend, Jerico, who keeps communication with West Ardougne via his pigeons.

Sneaking backEdit

Items required: Pigeon cage, bird feed

Speak to Jerico, who lives in a house just south of the northern bank in Ardougne and just north of the chapel.

After talking, search the cupboard for some Bird feed, and grab a Pigeon cage from the backyard.

Omart location

Location of Omart.

Releasing the Pigeons

Creating a distraction.

Speak to Omart, who can be found west of Ceril Carnillean's house in East Ardougne, just southwest of the castle. When you talk to him, he says that although he can move you over the wall, it is too risky as the watchtower guards are too close to the wall. The guards need to be distracted so that you can find an opportunity to enter the city.

Head to the small watchtower along the wall, directly north of Omart. Stand in the corner where the two spiked fences meet, use the bird feed on the watchtower fence, then click the cage in your inventory.

Go back and talk to Omart, who will call out to his assistant, Kilron, to throw over the rope ladder. Climb over the ladder into West Ardougne.

Infiltrating the Mourner HQEdit

Items required: Rotten apple (must be apple in quest, others from Yanille or Seers' Village do not work)

Mourner Tunnels

Mourner HQ is due northeast of West Ardougne.

Head to the Mourners' Headquarters located in the northeastern corner of the city. Try to enter, but you will not be allowed in by the mourners. Go around the headquarters to the northern part, where you can see a cauldron being cooked in the backyard. Pick up the rotten apple laying on the ground just to the west, and squeeze through a gap in the fence into the backyard.

Use the rotten apple on the stew that is brewing in the cauldron, making sure you right-click the apple; otherwise you will eat it. Squeeze back through the fence and walk around to the front of the building, and attempt to go inside again. One of the mourners will tell you that the player is not permitted inside because several mourners are ill with food poisoning and are waiting for a doctor.

Nurse Sarah location

Nurse Sarah's house.

Head to nurse Sarah's house - the large building southwest of the West Ardougne church. Search the cupboard in the northern part of her house to obtain a doctors' gown. Equip the gown, and go back to the headquarters. The professional attire will easily fool the mourners into letting you into their base. For all subsequent visits to the headquarters during the quest, the gown must be worn at all times.

Go upstairs and kill a mourner. A key will automatically be placed in the player's inventory. Use the key on the gate to get inside the caged room. Search the crates to find Elena's distillator.

Exit the headquarters, and head back to Kilron at the southeastern corner of West Ardougne. He will help the player get back over into East Ardougne. Alternatively, players can head through the sewers as they are no longer blocked. Go to Elena and give her the distillator.

Getting the touch paperEdit

Items required: Falador Teleport or amulet of glory (optional)

Chemist location

The chemist's location.

Bank the 4 items Elena gives you (there is a bank east of her house) then teleport to Falador or Draynor Village. Teleporting or accepting random events with the samples causes them to break and you will need to talk to Elena again to get more. Withdraw the samples from the bank and go to the Chemist in the southwestern corner of Rimmington.

If you have the Falador Hard Diary completed and have access to the Crafting Guild, you can use a skills necklace to teleport to the Crafting Guild (bank the 4 items in Ardougne first) and access the bank there. Alternatively you could bank the 4 items in Ardougne, teleport to Pest Control using the Minigame Group Finder, take the 4 items from the bank in Pest Control, take a ship to Port Sarim, and walk to Rimmington (travelling in a ship DOES NOT damage the samples).

While speaking to the Chemist, avoid all chat options that state you have a plague sample! He'll destroy it and you have to return to Elena to get a new sample.

He will then give you the touch paper needed to continue the quest.


Items required: Liquid honey, etheneasulphuric broline, and the plague sample.

Chancy, Da Vinci, and Hops are located right outside the chemist's house crowding around a fire. Make sure to give each bottle to the right person, or you will not receive them when you get to Varrock.

Give Chancy the liquid honey, Da Vinci the ethenea, and Hops the sulphuric broline. Once you have given the vials, they will tell you to meet at the Dancing Donkey Inn in Varrock.

Helper Sample Vial Reason
Chancy Liquid honeyLiquid honey Owing to its low value, Chancy cannot wager the liquid honey in a gamble.
Da Vinci EtheneaEthenea Da Vinci cannot use the ethenea to create a "work of art".
Hops Sulphuric brolineSulphuric broline Hops will not drink it because of its poisonous nature.

So far, so goodEdit

Items required: 10 Coins or a priest gown top and bottom, the plague sample and touch paper.

Deposit the plague sample in the bank (there is a deposit box on the northern parts of the docks of Port Sarim), then teleport to Varrock. Buy a priest gown set from Thessalia's Fine Clothes. Equip the gown, withdraw the sample from Varrock east bank and proceed to the fenced area to the southeast.

Head to the fenced-in enclosure in southeastern Varrock. Go to the Dancing Donkey Inn with the plague sample and talk to Hops, Da Vinci, and Chancy to get the vials back. Having a full inventory will require you to obtain a new set from Elena. Do not pass back through the gate at this point or your vials will be confiscated on return.

(Ultimate Ironman note: Passing the gate with only sample in your inventory does not get you caught)


Items required: The plague sample, touch paper, a priest gown, and an Ardougne teleport (51+ Magic suggested). An alternative method to get to Ardougne is the Battlefield of Khazard teleport via spirit tree, if you have completed the Tree Gnome Village quest. You could also to teleport to Edgeville via an amulet of glory, then use the teleport lever south of the bank to Deserted Keep, then use that teleport lever to Ardougne -- note that Deserted Keep is deep in the wilderness although you will only be there for a second.

Equip your priest gown and head to Guidor's house in the southeastern corner of the gated area. Talk to Guidor to give him the vials and sample, and tell him that Elena has sent a sample that needs to be processed. After analysing it, he will come to a surprising conclusion. He tells you that the plague is just a lie.

Return to Ardougne, and talk to Elena. When you tell her that Guidor found nothing in his results, she suggests that the plague must be a hoax and that you should speak to the person on top of this - King Lathas of East Ardougne. King Lathas is located just south of Elena's house, in his throne-room on the 1st floor[U.K. floor] of East Ardougne Castle.

When told that the plague is in fact a hoax, the King replies that he did it for the best of his people, and that it protects them from a "far greater danger". He then tells the player about the journey of King Tyras - the king of West Ardougne and King Lathas's brother - towards the west and that he has been corrupted by a dark lord after drinking from the Chalice of Eternity. Hence, the wall has been erected between the cities to protect East Ardougne and in turn, all of RuneScape.

Congratulations! Quest complete!


Biohazard reward scroll


Required for completingEdit

Completion of Biohazard is required for the following:

Also on Fandom

Random Wiki