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This is the quick guide for Biohazard. For a more in-depth version, click here.
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Walkthrough
| Start point |  Talk to Elena in her house in East Ardougne. She lives right across the road from where you started Plague City. | ||
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| Member requirement |  Members only | ||
| Official difficulty |  Novice | ||
| Official length | Long | ||
| Requirements | Skill requirements are not boostable unless marked with a [B] for boostable.
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| Items required | Items from the tool belt are not listed unless they do not work or are not automatically added. Priest gown top and bottom (can be obtained during the quest for 10 coins) | ||
| Enemies to defeat | Level 13 Mourner |
Quests:
Getting Started
- Talk to Elena in a house just West of East Ardougne North bank across a river.
- Talk to Jerico who lives in a house just South of Ardougne North bank.
- Talk to Omart who is located just outside of the Southeast corner of West Ardougne's walls (just head south of Elena's house).
- Talk to Jerico, and ask about using the messenger pigeon to distract the guards.
- Search a nearby cupboard to find Bird feed and then take a Pigeon cage from his backyard.
- Go to the watchtower guarding West Ardougne's gate.
- Use the bird feed on the corner of the watchtower fence where the fences meet.
- Open the pigeon cage.
- Talk to Omart.
Mourner Headquarters
Martha Rehnison's House
- Go to Martha Rehnison's house located North of the West Ardougne town square.
- Take the Rotten apple on the Eastern side of the house (Please note it is outside).
- Travel East and squeeze through a gap on the west side of the Mourner's fence.
- Use the rotten apple on the cauldron. (Be careful not to eat it, as "Eat" is the primary action.)
- Go back through the fence and attempt to go through the front entrance.
Infiltration
- Go to Nurse Sarah's house to the Southwest of West Ardougne's church.
- Search the box in the house to obtain a Doctors' gown.
- Equip the gown and enter the Mourner Headquarter's front entrance.
- Go upstairs and kill a Mourner.
- Use the newfound key to get into the caged room.
- Search the crates to find the Distillator.
- Exit West Ardougne with the help of Kilron or by going through the sewers.
- Talk to Elena.
Samples
Note: Do NOT attempt to use any means of teleportation at all while holding the Plague sample! It will disintegrate. The other samples aren't that delicate. You can teleport with those.
- Go to Rimmington. To do this quickly you can bank the plague sample and use your Clan vexillum if you have one to teleport to the Clan Camp (any other teleport method with a nearby target location works too), then retrieve the sample from the closest bank. (You can only talk with the Chemist about touch paper if you have the Plague sample with you.) Find the Chemist in the Westernmost house and tell him that Elena needs touch paper. Do not mention the plague sample.
- Ask him if he has ideas on how to get the samples past the Varrock guards.
- Go to his three followers right outside his house. Give Chancy the Liquid honey, Da Vinci the Ethenea, and Hops the Sulphuric broline.
Delivering the Samples
- If not done already, obtain a Priest gown set and equip it. (From Thessalia's Fine Clothes located on the west side of Varrock Square.)
- Go to the gated Southeast corner of Varrock.
- Go through the gate.
- Talk to the chemist's assistants at the Dancing Donkey Inn to get the vials back.
- Go to Guidor's house in the Southeast corner inside the gated area.
- Talk to Guidor and give him the samples.
Finishing Up
- Talk to Elena.
- Talk to King Lathas who is located upstairs in the Ardougne castle South of Elena's house.
- Quest complete!