FENRIS Mech

FENRIS Mechs are anti-infantry mechs that resemble varren or Earth wolves. Like the similar LOKI and YMIR mech models, these machines have white exterior armor and have parts that emit red light. FENRIS Mechs appear to attack by charging at their target, while their "heads" discharge electricity which may be how damage is inflicted. When their health meter is fully diminished, they will deactivate and remain stationary. If shot while in this deactivated state, they will explode. FENRIS mechs also possess advanced sensory equipment allowing them to detect weapons and narcotics

Mass Effect 2
Commander Shepard encounters FENRIS mechs and other mech models frequently in combat. Shepard is seen fighting FENRIS mechs while on Freedom's Progress before encountering Tali. FENRIS mechs are also encountered on Illium during Shepard's search for Thane. FENRIS mechs are very weak, and Disruptor Ammo fire will bring them down quickly.

Trivia

 * FENRIS Mechs are likely named after Fenrir (also known as Fenrisulfr, meaning 'Fenris wolf'), a monstrous wolf featured in Norse mythology.
 * They are very similar to Houndeye aliens from the videogame Half-Life.