Biohazard

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Instruction manual.png
This quest has a quick guide found here.
It briefly summarises the steps needed to complete the quest.
The wiki defaults to the British convention for floor numbering: Ground floor, first floor, etc. This may be changed by clicking the moon icon at the top right of the site.

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.

Details[edit | edit source]

Walkthrough[edit | edit source]

Confiscated[edit | edit source]

Items required: None.

Elena's 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 back[edit | edit source]

Items required: Pigeon cage, bird feed, Gas Mask

Speak to Jerico, who lives in a house just south of the northern bank in Ardougne and just north of the chapel. Click on the first cupboard on the north wall. Search it and you will find the required bird feed, then go behind the house to grab a Pigeon cage.

  • OPTIONAL: If you are planning on doing One Small Favour, grab and bank an extra 5 pigeon cages. The cages are fairly close to the quest objective so this isn't necessary.

Speak to Omart, who can be found west of Ceril Carnillean's house in East Ardougne, just south-west 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.

Omart's location.
Creating a distraction.

Head to the small watchtower along the wall, directly north of Omart. Stand in the corner where the two spiked fences meet, put the bird feed on either 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 (you must have the gas mask equipped otherwise you will not be able to progress any further with the storyline).

Infiltrating the Mourner HQ[edit | edit source]

Mourner HQ is due north-east of West Ardougne.

Head to the Mourners' headquarters located in the north-eastern corner of the city. Try to enter, but you will not be allowed in due to the mourners eating their stew, you need to find a way to distract them. Go around the headquarters to the northern part, where you can see a cauldron being cooked in the backyard. Squeeze through a gap in the fence into the backyard, and pick up the rotten apple laying on the ground just to the east.

Right click on the rotten apple and use it on the stew that is brewing in the cauldron. 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 you're not permitted inside because several mourners are ill with food poisoning and are waiting for a doctor.

Nurse Sarah's house.

Head to nurse Sarah's house - the large building south-west of the West Ardougne church. Search the cupboard in the northern part of her house to obtain a medical 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.

Note for Skillers: After talking to the mourner, he will start attacking. A ring of recoil will quickly take him out and the key will appear in your inventory, without the need to do any damage.

Go back to Elena and give her the distillator. You can now go through the sewers via the manhole then climb the mud pile into Edmond's garden near Elena's. Alternatively head back to Kilron at the south-eastern corner of West Ardougne. He will help the player get back over into East Ardougne. Remember to then go back to Elena and give her the distillator.

Touch Paper from Chemist[edit | edit source]

Items required: Falador teleport or amulet of glory (optional), brown apron (optional) or House teleport if your house is located in Rimmington

The chemist's location.

After talking to Elena and obtaining from her the Liquid honey, ethenea, sulphuric broline, and the plague sample, make your way to Rimmington via teleportation (note: the chemicals and plague sample will no longer get deleted). To get to Rimmington: Teleport to Falador or Draynor Village, the cabbage patch, or use the single, south-eastern dock in Ardougne and pay 30gp to Captain Barnaby to travel directly to Rimmington.


Go to the Chemist in the south-western corner of Rimmington.

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

Foresight[edit | edit source]

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

The chemist states that the Varrock guards are looking out for someone carrying suspicious materials. He recommends using his 3 errands runners to smuggle the items into Varrock.

Chancy the gambler, Da Vinci the artist, and Hops the drinker are located right outside the chemist's house crowding around a fire. Talk to each of them to give them their respective vials. If you give the wrong vial to someone, give the remaining vials to the others, speak to them all in Varrock, then return to Elena to get new vials before repeating this step.

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

So far, so good[edit | edit source]

Items required: 12 coins or a priest gown top and bottom, the plague sample and touch paper.

Go to Varrock and equip a priest gown set (you can buy one from Thessalia's Fine Clothes for 10 coins or Fancy dress shop owner to the north of Guidor for 12 coins), and proceed to the fenced area to the south-east.

Head to the fenced-in enclosure in south-eastern Varrock. The guard will search you when you try and pass through the gate. The guard will confiscate the vials if you try and pass with them but the plague sample is safe to bring through.

The Dancing Donkey Inn's location.

Go to the Dancing Donkey Inn (inside the gated area) 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 the chemist.

Warning: Do not pass back through the gate at this point or your vials will be confiscated on return!

If you do not bring the plague sample or papers with you, you can go to Varrock east bank and retrieve them, drop the vials at the gate, quickly run to Varrock east bank for the items, and quickly run back to pick up the vials.

Telekinetic grab no longer works to grab the contents, if you try you're told you can't cast this spell on that object. So make sure to have both priest gown items before you enter.

Secrets[edit | edit source]

Items required: The plague sample, touch paper, a priest gown.

If at this point you've forgotten your priest gown, you can obtain one for free by talking to Asyff in the Fancy Clothes Store. Equip your priest gown and head to Guidor's house in the south-eastern 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[edit | edit source]

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[UK]2nd floor[US] of the 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 the 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!

Rewards[edit | edit source]

Biohazard reward scroll.png

Changes[edit | edit source]

Date Changes
25 July 2019
(update)
  • (Undocumented) Teleporting with the plague sample and vials no longer breaks them.
  • (Undocumented) The errand boy hands over the vials faster.
  • (Undocumented) Talking to the Chemist or Guidor does not affect quest items.

Trivia[edit | edit source]

Required for completing[edit | edit source]

Completion of Biohazard is required for the following: