Ezno Randall

Ezno Randall is an enhanced human mercenary and Cerberus commander. Randall was formerly an N7 Lieutenant and marine in the Systems Alliance known for having anti-alien attitudes and poor ethical judgement. During the Reaper War, Randall acted as a commander to Cerberus' efforts in stopping Captain Shepard and preventing the destruction of the Reapers.

Randall serves as a secondary antagonist and prominent boss in Mass Effect 3.

Gameplay
Randall is featured as a boss in three gameplay segments: one in Thessia, one in the Citadel, and one by the end of Kronos Station. Though his central mechanics persevere through all encounters, his tactics sequentially evolve and become more complex.

By default, Randall uses a Cerberus M-96B Harrier assault rifle as his primary weapon, equipped with a grenade launcher which he occasionally uses to flush his targets out of cover. While running the Harrier, Randall takes cover, but mantains frequent movement. As of his encounter in the Citadel, Randall takes with him a ??? shotgun and ??? sniper rifle that enable different strategies. When close to Shepard, he will draw his shotgun and attempt to flank, but if suppressed, he will use a sniper rifle to shoot them from cover.

Randall will spawn with a Biotic Barrier protecting him. When Randall's secondary protection is removed, the player has 10 seconds to take as much Armor or Health from him as possible, during which period he will not use any of his abilities, as they are in forced cooldown. After this time expires, Randall will deploy either a Shield or Biotic Barrier to protect him for some more time, and depending on which he uses, his strategy will change.


 * If Randall activates a Shield, he will soon activating Cloaking and use it to either back away from the player's position and attack it with a sniper rifle (which has a laser pointer attached, easily identifying Randall's position), or walk around the arena until he can approach Shepard and land a melee attack with his sword. The player must quickly press the melee button just at the right time to parry Ezno's sword attack, which will stagger him and leave him open for a heavy attack. If the player fails in this interaction, Ezno's attack succeeds, causing severe damage. In Thessia, Randall will only use one melee attack; in the Citadel, he will use two, and in Kronos Station, he will use three.
 * If Randall activates a Barrier, this signifies he will now be using Biotic abilities to complement his arsenal. His tactics will remain the same as his default stance, but he can now use Singularity on the player and its squadmates. When taking cover, he will also employ the use of Kinectic Walls to shield him. In addition to these, during the Kronos Station battle, he may also use Charge to force his melee interaction.

In the Citadel, Randall will receive Cerberus reinforcements when at low Health, and in Kronos Station, at the very beggining of the boss fight.

Trivia

 * Randall is heavily inspired by the DC character Slade Wilson/Deathstroke. The similarities can be mainly noticed in their age, combined arsenal of firearms and sword, and experience as hired assassins.
 * Being able to use a large assortment of weapons, including a grenade launcher attached to his assault rifle, in addition to Cloaking, Biotic abilities and engaing in melee combat with his sword, Randall is one of the most tactically rich boss fights in the Mass Effect trilogy.