Deus Ex: Human Revolution

OK she is ultimately child's play if you have the stun gun. The stun gun... well it stuns her, obviously, but it does damage as well. And you can headshot with a stun gun. Fortunately her stun animation is longer than the stun gun reload animation.

So let her charge you, there will be a brief pause after she does so. Now hit her with the stun gun.

Keep hitting her with the stun gun, preferably in the head/neck area, ensuring that she doesn't break out of stun. After about 8-10 shots she should go down.

A little cheesy, but on Give Me Deus Ex with a stealth character it's prolly the best way to go about it.

Easy boss fight, even on "Give me Deux Ex".

All I used was 4 frag mines and the combat rifle.

The fight starts off with her charging at you. I ran immediately to the left behind one of those walls. I placed a mine at the only two ways she could get at me. She ran at me, hit the mine and was stunned. I popped around the corner and pumped rounds into her head till she recovered. Then rinse and repeat. The fight lasted less then a minute and I still have one frag grenade she didn't hit.

Just to note there are plenty of lockers around the place you fight her if you are low on anything.

I had an upgraded typhoon augmentation. As soon as she ran at me I used the typhoon. I used it three times and she went down. I was playing on the Give Me Deus Ex difficulty. A little cheesy, but it was quick and painless.

Just so everyone is aware - on Give Me Deus Ex Difficulty, FOR ANY BOSS FIGHT: 3 to 4 Typhoon hits will end the fight.

Stock up on Typhoon ammo and energy bars. At the beginning of the Yelena fight, or whoever, make sure you have enough typhoon shots, and energy bars, to pull off 4 (it may be 3, I forget) and she will go down.

Fight done in under 30 seconds.

And don't worry if she is shooting you - you are invincible during the typhoon animation.

Questions, corrections and neg vote justifications below.

Following weapons and augmentions I used
- Dermal Armour at Damage Reduce 3 and EMP Shielding
- Heavy Rifle (With a big ammo bank - Can be gotten before entering the room)
- Recoil Compensation at 2

__Yelena causes damage by her twin Machine Pistols, Typhoon and will do 50 points if you try to CQC her__

A effective method used when up against Yelena was to let her running around and charge at you (Eliza will let you know when she is close), When she's in sight, shoot one of the four power generators until it explodes, the resulting explosion will send a electrical current across the entire floor, stunning her with a possible injury

((It can affect you , BUT If you have EMP Shielding, you are unaffected by the voltage and take no damage. ))

While Yelena is stunned from the current, offload a few heavy bullets into her until its close to overheating, but keep some distance because when she recovers she will charge again, too close and she'll activite the Typhoon against you

((With Recoil Comp. 2, Your firing won't be affected during the Heavvy Rifle's rapid fire and you'll fire at a straight line at her))

If she recovers from the shock, destory another generator and repeat the offload after a bit (mostly twice or three), she will be defeated

Any questions or Comments please let me know

Good luck

(Played on Give me Deus Ex) I used about 3 bursts of Typhoon, running away between each one to let my energy recover. When she's stunned from the blast lob in a grenade / empty a clip at her to add more damage.

Okay well if you’re like me and don’t have enough stun rounds, or any other weapons besides the heavy rifle found outside the door before the boss fight and are struggling, this is what I did:

Right after the cutscene, she starts in front of you and charges at you. Just try and run far enough away past her so you don’t get hurt too bad by her attack. Once she pauses for a moment after her attack, hit her with the stun gun right away and switch to your heavy rifle as fast as you can. Then start unloading on her. It’s about 50 bullets before the rifle has to cool down so get up super close to her and try and make sure as many as possible hit her in the head. When she pulls out her guns, just step to the side as she only fires in one direction once she starts.

Then she will run away, take time to hide behind the walls and regenerate health; don’t go looking for her. Once the AI tells you she is coming again, move back into the open and let her charge at you. This time though (and all times after this), she will charge at you three times. Once you dodge her three times, stun her, switch to your heavy rifle, fill her with bullets until she pulls out her gun and shoots for a bit, then runs away, hide to regen health and repeat.

I only had 6 stun rounds and I believe it took me 4 and about 150-200 heavy rifle bullets to finish her off. There is plenty of heavy rifle ammo in the room where you find the heavy rifle.

My advice would be to go by the top solution and hoard stun rounds so you don’t have to go through the frustration of finding another way out, but if you’re out of luck this is another way to go.

For those wondering, yes I did this on the hardest difficulty, Give Me Deus Ex.