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The following section contains information from a previous version of StarCraft II: Heart of the Swarm which is no longer valid.

Mutagens were collected by Sarah Kerrigan's zerg throughout the StarCraft II: Heart of the Swarm single player campaign. She could use them to purchase upgrades to specific zerg units.[1] It is collected from various creatures in missions.[2] Abathur directed this process at the evolution pit.[1]

Mutagens were cut from the game, as developers felt it was too similar to the game mechanics of Wings of Liberty. A new system was developed where zerg upgraded over time, leading to an evolutionary branch a player could choose with a specific mission.[3]


  1. 1.0 1.1 StarCraft Legacy staff. 2011-05-30. May 2011 HoTS Gameplay Info. StarCraft Legacy. Accessed 2011-05-31.
  2. 2011-05-31, Blizzard Insider Interview With Dustin Browder. Blizzard Entertainment, accessed on 2011-07-08
  3. 2011-10-22, BlizzCon 2011 - Starcraft 2: Heart of the Swarm - Campaign and Lore Panel (Full). YouTube, accessed on 2011-11-07

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