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- For ADVENT MECs, see ADVENT MECs.
Exclusive to the Lost Towers mission in the Shen's Last Gift DLC, Derelict MECs are exactly what it says on the tin: old rusted MECs armed with old weapons and armor. They carry a heavy autocannon and have only four health points, but are reinforced with two points of armor. However, they make up for these deficiencies with being deployed in endless numbers during the mission.
Physically, these MECs are old and rusted, with a skull-like head and wearing a black ballistic vest for protection. They also lack the ADVENT MEC's grenade launcher.
The two main strengths of the derelict MECs are their ability to self-destruct, and during each section of Lost Towers, a constant stream of them will be deployed during each enemy turn. When self-destructing, derelict MECs will spend one turn arming, and only during the next turn will they be able to use it to attack your soldiers. Killing a self-destructing MEC will also cause it to explode prematurely, so try to keep your distance from them.
During the final battle against Julian, hacking Julian's sectopod will allow you to attempt a hack that will turn all the MECs friendly, allowing you to divert Julian's attention from your own squad.