My hot tipz and trickz against the Chosen (actually, how they behave, fighting them is always a mess):
A general advice is that while fighting the chosen, timer stops. This is specially good against the assassin.
Chosen don't scamper. If you find them, they will do their speech, but just stand where they are. This is specially good against the hunter. (but if they find you, they'll act right away)
Assassin:
From when she appears, the assassin will beeline torwards you to do her guaranteed damage attack. She won't always do it right away, tho. It is common for her to stalk you a little bit, which will give you opportunity to stalk her and get the fight started on your terms.
That being said, since you most likely have no idea that she is around, you will not know that you are looking for her, so the advice is to spread your troops a little bit, just in case someone stumbles upon her.
The reaper, obviously, is great for this.
But aside from that initial very scary very damaging attack, she won't actually do much more to hurt you. The wave causes little to no damage (it may actually only cause damage later in the game) and her blind bomb is just annoying most of the time.
The tricky thing about the assassin is that she runs at you, meaning that there will be other pods on the map by the time you fight her and the best strategy is to hunt her down, try to stay close.
If you are hunting her down backwards, it's great (as said, the timer is frozen during the fight), but, as always, be careful about moving into the fog of war. Fighting a chosen + a pod is always very very dangerous.
Her map modifier is just herself. She will rush you. If timer is not an issue, you might want to sit back and wait for her to come, but that could backfire, so no definitive answer here.
Hunter:
The hunter is a bit unpredictable, he will usually stay at the end edge of the map, but sometime, depending on how the map is, he will grapple way forward.
Fighting him is probably the most straightforward. Don't group your people because he has an AoE dazzling bomb.
Different than the other two, staying in cover might help in this fight, as the hunter seems more concerned with shooting you down than capturing you (which fits his personality), having said that, if you can trade cover for a flank, I'd take it, he is so accurate that he has a good chance of hitting you anyway, so ending the fight earlier is better than being defensive.
Since he is actually causing you damage each turn, he is the most dangerous to fight with a pod, luckly, he always gives good indications of where he is, so you can have a certain degree of control of when to start the fight. He is unpredictable because sometimes he will just grapple torwards you, but that's just how his AI goes, it grapples around, it is not trying to chase you down like the assassin.
His map modifier is the easiest to deal with, just move out of the way. All it means is that one of your soldiers is possibly being forced to move out to a worst position; there's no real way to deal with it either, you could break LoS, but that's a bigger hassle then moving the one soldier that is tracked. The hunter do this every turn if he wants too, though he seems to favor turns when there are activated enemies, but it's only annoying most of the time.
Warlock:
The warlock is either the easiest or the biggest nightmare depending on how the fight goes: On one hand, he is the most shy of the three and will almost always stay the further away from the fight, meaning you will mostly fight him alone. The game also constatly shows you where he is.
On the other hand, his behavior is to move *away* from you and do his mind tricks, specially his very dangerous mind control.
As the game progresses, his dazzling attack (mind scorch) will improve to have a chain lightining effect with quite a big range, so a bad warlock fight will go like this:
He will summon something (which the other chosen do it, too, but here is more crucial), dazzle two, maybe three people and he will move away to a very good fortified position.
So you will spend the entire turn un-dazzling and fighting whatever he has summoned. Next turn, with most your team dazzled, he will mind control someone. And if you don't have an answer for that, you're just screwed. Expect to lose someone because a mind controlled soldier is more dangerous than any enemy of the game.
Mind control last either 3 turns or until he does spectral warrior, which is a blessing, because that breaks mind control right away. If he mind control someone else, your old mind controlled soldier will first act and then regain control, this is usually the worst case scenario.
Answers to mind control include frost bombing or flashbanging your own soldier, since neither of those break the mind control when used on the warlock. Frost bomb being the best option. Mimic beacons also fool your own mind controled troops and on retaliation mission, they seem to favor killing civilians. so this is the good news against the warlock: his most dangeroung attack can be dealt with. Mind shield also works, I don't like the idea of sacrificing other items for mind shield, but it is a direct counter.
As for strategy, just close that distance, he isn't very mobile, but unlike the other two, he is actively trying to stay away from you as much as possible. Since he almost always is the last thing you fight in the map, then you can usually close that distance.
His map modfier is also the scariest one, since he puts one to three enemies on the map for you fight against, one having rapture, which makes him explode when either killed or left alone. So if the timer is not a concern, it might be a good idea to only move right after killing his ghosts because he only does those every 3 turns and you don't want to add more enemies to a fight already in progress. Of course, if you are on a timer, you might not have a choice, so just remember that a raptured ghost is a guaranteed AoE damage against you.
Rapture only activates after the ghost moves, so you can overwatch it without fear (and is usually the best way of dealing with them).
This being XCOM, these fights can either go amazing or horrible or amazing with a spice of great tragedy.
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