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The Parasitism 5 contract is a priority task for the Sekiguchi faction in Marathon, containing three different activities. It’s the final contract in the series, and this guide will help you complete all three tasks.

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Marathon Parasitism 5 contract walkthrough

The Parasitism 5 contract can be broken down into three tasks.

  • Extract a biotic sample from Sparkleaf in Bio-Research.
  • Synthesize SIMbiont in Quarantine and inject yourself.
  • Allow the SIMbiont to integrate with your shell; then exfil.

How to extract a biotic sample from Sparkleaf in Bio-Research

For the first task, head to the Bio-Research location in the northern area of the map. You’ll first need to pick up Sparkleaf, which grows among vegetation.

Sparkleaf in Marathon
Image via Bungie

There’s no specific location, but this plant is fairly common. Once you find a Sparkleaf, head to the marked location in the image below.

Terminal location in Bio-Research
Screenshot and remix by Destructoid

You’ll find an extraction machine, which you’ll use to extract a biotic sample from the Sparkleaf (place it in the machine and then wait for a few seconds).

Sparkleaf bio-printer in Marathon
Image via Bungie

How to synthesize SIMbiont in Quarantine and inject yourself

Central Quarantine terminal in Marathon
Screenshot and remix by Destructoid

Pick up the sample and head to the southwest part of the map, where you’ll find the Quarantine POI. I have marked the location where you’ll find a small room with the terminal inside (will be highlighted by a quest marker when you’re there).

Synthesizer in Quarantine
Image via Bungie

Access the Synthesizer and place the sample to get the SIMbiont. Inject yourself with the item and wait for 90 seconds. You’ll need to survive a UESC onslaught as the SIMbiont integrates with your shell. After you manage to survive, safely exfil from the map, and you’ll complete the final Parasitism contract in Marathon.

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