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The Promethean Crawler is an advanced Forerunner AI that appears as an enemy in Halo 4. They are quadrupedal in design, and are capable of both close-quarters and long-range combat, having been engineered to ferociously hunt down and eliminate any foreign threats. It is common to encounter Crawlers in substantial numbers, as most travel in large packs and work together in strategic coordination to bring down enemies by overwhelming them from every conceivable angle.
Similar to the Covenant's Unggoy, Crawlers act as the cannon fodder of the Prometheans. However, with their advanced agility and use of harassment tactics, they actually fight in a manner more similar to the Covenant's Skirmishers. They are also similar to the Yanme'e, due to their swarming nature and ability to attack from unusual angles.
The standard Crawler is the most common variant. It is able to cling to surfaces and melee the player. They are equipped with a Boltshot.
Crawler Primes (or Alpha Crawlers) are the leaders of packs of Crawlers. They are easily distinguishable from other Crawlers because of their spines. They utilize the Suppressor.
Crawler Snipers are similar to regular Crawlers, except with an additional "horn-like" segment on their head, extra face-protection around their mandibles, and a large fin on their back. They are the Promethean forces' scouts and snipers, lurking and picking off their enemies from afar. They utilize the Binary Rifle and can track foes through obstacles with Promethean Vision.
- Crawlers are very resilient towards shots to their bodies, but can be eliminated with a single headshot.
- Despite their small size, their melee attacks are very strong. Avoid close-quarters combat with them as much as possible.
- Crawlers are the most common native enemy on Requiem.
- Crawlers do not use the Boltshot's charged shot.
- Cortana states that Crawlers have similar cortical footprints to the Knights.
- Crawlers make a distinctive sound when they leap into the air.
- It's also possible for a Crawler to use a LightRifle, although this can rarely be seen. At least one Crawler using a LightRifle spawns in Spartan Ops: episode six, chapter five, found around the third collected IFF tag.