IG-100 AB-4 "Vigil" has had every external component painted black as night, with attempts to minimize the brightness of external lights and features. This allows this IG-100 MagnaGuard to more easily blend into the shadows and darkness unseen.

IG-100 AB-4 "Vigil" has been modified from standard design parameters to be fitted with reinforced plating. As a result, when compared side by side with the standard IG-100 MagnaGuard, IG-100 AB-4 "Vigil" is found to be more durable while its ability to move has been inhibited.

IG-100 AB-4 "Vigil" has had its programs re-written and mechanical systems hard-wired for combat operations. This augmentation gives this IG-100 MagnaGuard a significant increase in combat efficiency in eliminating targets on behalf of Lynnyaria Meraudstar, but at the expense of it being usable for much else except for combat.

IG-100 AB-4 "Vigil" has developed a quirked personality, granting it an inclination towards heavy doses of sarcasm when engaged in dialogue. As a result, IG-100 AB-4 "Vigil" comes across as having issues taking direction and developed a reputation for 'snark'.