How can I engage combat with The Chosen Assassin without taking damage?

The Assassin seems to often begin combat (including her first story mission debut) cloaked, being all but completely undetectable until she attacks. She is also often immune to Overwatch fire both before and after being revealed. Therefore, it seems impossible, or at least implausible, to engage her before she attacks at least once. Her attacks are also highly accurate (if they obey the same rules as her sword loot drop, they are always 100% and cannot miss).

This attack can be dangerous, dealing serious damage or even leading to an instant-kill. As such, I would want to avoid taking any hits at all. However, I do not see how that is possible. Are there any ways to deal with The Assassin without letting her attack you first? Alternatively, are there reliable ways to defend against the first attack?

Possible ideas:

  • Shooting explosives or flashbangs toward random areas where she might be (Implausible, unlikely, and wasteful).
  • Using Hunker Down (may or may not work, depending on the accuracy of the attack).
  • My tactics include clearing out all other enemies, then moving my soldiers into a fairly open area, and setting up one soldier as bait. The other soldiers scattered so she can't knock them over with the wave. Then blow up the wall she is hiding behind and shoot the living hell out of her. It won't get rid of the "she attacks you first" problem though. – Sumurai8 Sep 9 '17 at 10:47

There are three simple solutions available to you.

  • Battle Scanner - Unlocked as part of the Advent Trooper autopsy. Battle Scanners will reveal all concealed units, including disguised Faceless, burrowed Chyrssalids, or the Assassin herself, works through walls, and is thrown like a grenade.
  • Scanning Protocol - Available to Sergeant+ ranked Specialists, this provides the same functionality as the Battle Scanner, though it cannot be thrown.
  • Flanking - Your last resort option --If you suspect the Assassin is nearby, you can move your soldiers to the far side of cover, to attempt to visually identify the Assassin. Just like your soldiers lose concealment when flanked, so too can you break the Assassin's stealth by achieving a flanking L.o.S., revealing her for everyone.
  • That last part about flanking is surprising! I thought thematically that she was actually turning invisible via a cloaking device or something, as opposed to just being really stealthy, so I didn't think that would work. This poses another question, though: If you do reveal her, will she still attack, or will she change her plans to regaining stealth before attacking? Can you prevent her from attacking at all by continuously revealing her? – Southpaw Hare Sep 10 '17 at 7:40
  • @SouthpawHare Nope. She's perfectly content to attack after being spotted. – Raven Dreamer Sep 10 '17 at 16:02
  • @SouthpawHare: This is similar to the Mimetic Skin gene mod from XCOM EW. It shows you as "blending" into the environment, but the effect disappears when you get flanked. – Flater Sep 15 '17 at 9:34
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    It seems like the Reapers can spot the Assassin without flanking. I managed to reveal her (twice, so far) with my Reaper in Shadow, while the Assassin was in half cover and I had a significant height advantage on her. I'm not sure what factors into this (being in Shadow, being in half cover, a height advantage, ...) but there seems to be a 4th Reaper-related option to uncloak the Assassin. – Flater Sep 15 '17 at 9:36
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    @Flater Whose turn was it? It's possible that either the Reaper had flanking sight of the Assassin during their move, or the Assasin was flanked by the Reaper during her move. – Raven Dreamer Sep 15 '17 at 18:28

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