XCOM: Enemy Within MEC Trooper Guide – Rank Progression and Tech Tree

Being a soldier isn’t easy, and it’s even harder if you are asked to give up your body completely for the sake of war. It’s a courageous feat that most would dub foolish, but it’s one that you probably won’t hesitate to implement on a couple of soldiers in XCOM: Enemy Within.

For more help on XCOM Enemy Unknown, read our Class Builds, Research and Building Facilities Guide.

XCOM: Enemy Within MEC Trooper

A completely new class called the MEC Trooper takes employed soldiers and converts them into mechanized killing machines. The process itself involves a lot of sacrifice, but gives them great combat superiority.

Any soldier can become a MEC Trooper. However, as stated before, it’s a class that requires a lot of sacrifice, and that sacrifice comes in the form of losing all your previous abilities and Gene Mods.

The augmentation process itself involves the replacement of limbs with cybernetic implants. This also strangely also grants your soldier a robot-like monotone voice. These though are just the aesthetical changes that follow.

Class Creation
The MEC Trooper isn’t a base class, it is actually a transformation class; you will take a present soldier, and perform augmentations on him/her. The soldier will lose its base class and associated abilities, and have it replaced with MEC Trooper abilities. The MEC Trooper will gain one ability based on its base class. However, the soldier’s rank won’t change.

This means that if you choose to make a certain Captain a MEC Trooper, he/she will remain a Captain even after the transformation, and will be able to rank up as well.

MEC Trooper Equipment

MEC Trooper does not use regular equipment like other classes. Instead, they utilize a Mechanized Exoskeleton Cybersuit. These suits grant the soldier significantly increased Health and Will. They also gain access to heavy weaponry and Tactical Subsystems, and are immune to DoT damage such as Fire and Poison.

Class Specific Abilities

Since the MEC Trooper isn’t a basic class, the soldier undergoing the augmentation will already have a class of his/her own. The MEC Trooper will gain a specific perk according to the initial class of the soldier.

The following are the perks:

Assault Class
Damage received from enemies within 4 tiles is reduced by 33%.

Heavy Class
The nearest visible enemy suffers -20 Aim and cannot critically hit this unit.

Sniper Class
Shots taken without moving have +10 Aim and +10% critical chance.

Support Class
Nearby allies in cover receive +10 Defense.

Rank Progression and Tree

MEC Trooper have their own Rank tree. They progress in a similar method, but have different tree perks that specifically focus on hardcore defense and offensive firepower.


Collateral Damage
AoE attack that destroys cover and hits all target in radius with 34% damage. This attack cannot cause critical hits.


Advanced Fire Control
Shots from Overwatch no longer suffer any Aim penalty.

Automated Threat Assessment
Confers +15 Defense when in Overwatch.


Vital-Point Targeting
Confers 2 bonus damage against targets that have been autopsied.

Damage Control
Damage will be reduced by 2 for the next 2 turns after taking a hit.


Jetboot Module
Allows to jump to normally inaccessible heights for the rest of the turn.

One for All
Activate to make MEC a high cover element. Moving or using an arm-based weapon cancel the effect.


Repair Servos
Regenerate 2 health at the start of each turn. A total of 6 health can be regenerated per battle.

Expanded Storage
Get one more use of Restorative Mist, Grenade Launcher and Proximity Mine Launcher in each mission. Increases primary weapon base ammo by 50%.


Using MEC’s primary weapon as the first action no longer ends the turn.


Absorption Fields
Damage more than 33% of the MEC’s maximum health is reduced to that number.

Reactive Targeting Sensors
If there is adequate ammunition, the MEC gets a free shot back at the first enemy that attacks the MEC in each turn.

Haider is a freelance contributor, who loves video games, playing guitar, and aviation. He is a competitive FPS player and also enjoys exotic RPG games like Diablo and Xenogears (his favorite game of all time) ...