The Zerremund is a slow-moving assault satellite that protects the Black Moon.
Zerremund satellites are encountered in the final mission unless Forte was chosen where a Zerremund is encountered earlier in her route conflict. No matter the case, the Zerremund is the toughest regular enemy in the game as its enormous array of weapons and extreme durability make it a tough target to shoot down. While they seem to be immobile, they actually have small engines that allow them to move, albeit, at nearly unnoticeable speeds. However, they can still turn their trajectory to get a better aim at its targets.
They are encountered again in ML but only in the mission where the first route conflict is solved, making them easy targets.