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Which units in Starcraft 2 cause friendly fire?

I already know that Siege Tanks do, as can misplaced Psionic Storms, but I was surprised to learn that Colossi and Banelings do not.

Which units can accidentally inflict damage on your own forces?

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The only units that actually cause friendly fire from splash damage are:

  • Siege tank shells
  • Psionic storms
  • Widow Mine attacks (except for other widow mines)
  • Raven's Seeker Missiles
  • Ghost's EMP
  • Ghost's Tactical Nuke

Some units that you might expect to cause FF splash damage but in fact don't are:

  • Yamato cannon on BCs (doesn't cause any splash)
  • Planetary Fortresses
  • Hellion/Hellbat attacks
  • Thor attacks
  • Baneling explosions
  • Infestor's fungal growth
  • Ultralisk attacks
  • Mutalisk attacks
  • Colossi attacks
  • Archon attacks

Edit: See this website for more details.

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  • Mutalisks should not be expected to friendly fire, 'cause everyone knows glave wurms are intelligent, cunning and compassionate! :)
    – Orc JMR
    Mar 22, 2013 at 17:14
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    @OrcJMR: For certain definitions of "compassionate".
    – Oblivious Sage
    Mar 22, 2013 at 17:18
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    Yamato Cannon does not cause any splash damage. Otherwise a great list.
    – OrwellHindenberg
    Mar 22, 2013 at 17:32
  • Yes you're correct, I worded the second list's title wrong. The Yamato cannon is basically a mini-nuclear explosion, and the animation for it might make people think it does splash so that's why I included it. I edited the answer, thanks!
    – Murkantilism
    Mar 22, 2013 at 17:46
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Currently the units which can cause friendly fire are Siege Tanks (in siege mode), Psionic Storms, Widow Mines, and Raven's Seeker Missiles.

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    You missed Ghost's EMP & Tactical Nuke. Although in most situations a player would have to either be an idiot or intend to EMP or Nuke themselves, it does happen accidentally. There's a common terran technique where the T will drop a nuke force an enemy retreat & gain a better position, then cancel it before it lands. I can't remember who did it, but I do remember in an SC2 WoL pro game TvP where the terran dropped a nuke to gain a positional advantage, then forgot to cancel and walked his army right underneath it.
    – Murkantilism
    Mar 22, 2013 at 17:19

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