ADVENT MECs are large robotic units that provide heavy support for other ADVENT units. They are similar to the XCOM MECs of Enemy Within, but are completely robotic in their exterior, and are a glistening white. They carry a variant of the Magnetic Rifle highly increased in size, and presumably damage. Additionally, ADVENT MECs have an automatic grenade launcher on their back, allowing them to fire a fusillade of micro-missiles in an AoE attack. ADVENT MECs are heavily armored, and have superior health to ADVENT troopers, as well as damage reduction in the form of armor points. As robotic units, they are vulnerable to hacking and having control of them given to XCOM for a short while, although a failed hack will increase the MEC's accuracy and defense.
- Barrage : ADVENT MECs can cause AoE damage with micro-missiles, damaging all units in the area and destroying environment.
- Suppression : ADVENT MECs are also capable of laying down Suppression fire on enemies, reducing aiming of the unit and triggering an overwatch shot if the unit move.
- The suppression can be broken if the unit dies, is flashed and sometimes when it receives damage.