Alpha Crawler

Alpha Crawlers (also known as Crawler Primes) are a class of Promethean Crawlers encountered by the UNSC on the shield world Requiem in late 2557.

Overview
Alpha Crawlers lead packs of lesser Crawlers. They are distinguished from other Crawler subtypes by the array of glowing hard light spikes, which indicate status, on their carapaces, and are armed with a built-in Suppressor. While they are designed to lead detachments of varying sizes, they can be found in excess of three or four per pack. They nevertheless serve the same purpose, to lead, augment and fortify. They are easily the most recognizable of their kind.

Gameplay
Dealing with Alpha Crawlers in combat is very dangerous, due to the fact that they will often continue to fire on enemies from a distance to overload shields and will follow up with close-in melee attacks to keep enemies' shields from recharging.

List of appearances

 * Halo 4
 * Spartan Ops