Kai Leng (enemy)

Kai Leng is an assassin working for the human-survivalist organization Cerberus. Leng was formerly a lieutenant and N7 marine in the Systems Alliance known for having anti-alien attitudes. He is described as being Earth-born with features that show his dominant Chinese heritage.

Mass Effect 3
Kai Leng is amongst the forces that Cerberus sends against Commander Shepard. Like Cerberus Phantoms, he is equipped with a palm device that projects a kinetic barrier, a projectile weapon in his right gauntlet, a tactical cloak and a sword for close-range combat.

Capabilities
Offensive:
 * Kai Leng uses occasional heavy-melee attacks if you allow him to get close. These attacks can kill you instantly unless you block them by tapping the melee key/button.
 * When encountered on Thessia Kai Leng will throw shockwaves which can knock your shield down if you're not in cover.
 * When encountered on Cronos Station Leng will punch new holes in the floor and summon additional enemies, but does not attempt to close with Shepard as aggressively.

Defensive:
 * Leng stops to regenerate his shields on a regular basis, making it difficult to damage him significantly, and he's immune to most crowd control abilities. When encountered on Thessia he's supported by a gunship during his recharge.

Tactics

 * Unless you're a close-range specialist, it's better to keep Kai Leng at a safe distance.
 * Lash with the shield piercing evolution will allow you to throw Kai Leng around like a toy.