Fog crawler

Fog crawlers are creatures on the Island in 2287.

Biology
Fog Crawlers are predatory shrimp-like creatures which live on the island surrounding Far Harbor. Physiologically they appear to be mutated descendants of a genus of shrimp. The existence of the smaller legs (swimmerets) on the underside of the Fog Crawler are evidence that it is (or was) an aquatic crustacean. It should also be noted that the chelipeds eventually fused with the arms, creating two large dagger-like appendages (chelipeds are the crusher-claws of a shrimp, similar to a crab's pincer). It seems that at some point the creatures' head had evolved to become separate from the main carapace, as well as morphed into a kind of arrowhead shape for an unknown reason. These creatures are remarkably tough, fast, and quite agile considering their size; capable of withstanding multiple Gauss rifle hits with very little loss of health. In terms of height, the average deathclaw stands just shy of a fog crawler, making fog crawlers the second largest biological entity in the game, second only to the Mirelurk Queen and behemoth.

Gameplay attributes
The fog crawler's main attacks are slicing with its arms and jabbing with its head. It also has an attack where it jumps up and slams back in to the ground, dealing massive amounts of damage to anything caught in the area of effect. This ground slam can deal damage even to targets well above the crawler's height level, such as human prey that believed itself safe on top of some object the crawler cannot mount. Due to their erect prosoma, fog crawlers can also strike at elevated targets with their arms.

Unlike mirelurk queens and super mutant behemoths, fog crawlers lack any form of ranged attack, a shortcoming they compensate for with deceptively high speed and agility. The monstrous creatures can cover considerable distances very quickly, thus making it hard to shoot them down before they enter melee range. Their speed also makes it more difficult to escape from them. It is therefore advised to always keep an ear open for the characteristic sounds fog crawlers emit, in order to avoid running into one by accident.

As mentioned above, especially the fog crawlers' higher-level variants are extremely heavily armored, boasting resistances in the mid four-digit range coupled with an obscenely large health pool. They are easily the most resilient threat the Sole Survivor can come across and arguably more dangerous than any other giant creature in the game. Deploying the heaviest firepower available is highly recommended in any fog crawler encounter past a certain level, considering some variants can shrug off multiple direct Fat Man hits without even breaking stride. Due to the crawlers' comparatively low energy resistance and non-existent radiation resistance, weapons that deal energy and/or radiation damage are the creatures' biggest weakness.

Although they are most likely the Island's apex predators and usually attack any human, animal or creature in sight, it is not uncommon to see fog crawlers team up with yao guai and anglers to attack settlements in waves, attempting to destroy the fog condensers.

Fog crawler
While rather weak in comparison to their higher-level variants, basic fog crawlers are still a force to be reckoned with and should not be approached without proper equipment. Their high resistances require powerful weaponry to overcome; single-shot guns with high damage output should be prioritized over rapid-fire armaments in order to have a better chance at punching through the crawler's heavy armor.

Glowing fog crawler
A step up from the basic variant, glowing fog crawlers boast increased resistances and hit harder, especially since their strikes deal additional radiation damage.

Enraged fog crawler
Enraged fog crawlers are the toughest non-legendary fog crawlers, boasting up to 4000 damage resistance. They are often seen covered in fishing nets and boat parts, with a light green color. These fog crawlers take almost no damage from ballistic and energy weapons, and have devastating melee attacks.

Enraged fog crawlers level with the player and are therefore immune to the Wasteland Whisperer perk.

Considering the damage resistance progression of all fog crawler variants (+50 per tier), the enraged fog crawler's DR of 4000, compared to its ER of 350, is probably a bug instead of an intentional trait.

Locations

 * A fog crawler regularly spawns west of Brooke's Head Lighthouse on the heart-shaped island.
 * One can be found at Dalton farm during the quest Blood Tide.
 * One can be found at the lake south-east of the Nucleus.
 * Shipbreaker, a unique named fog crawler, can be hunted down as part of a quest with the same name. The locations of both the crawler itself and the radio frequency necessary to start the quest are random. Shipbreaker will only appear while its associated quest is active.
 * Multiple levelled fog crawlers may lead attacks of yao guai and anglers on player-controlled settlements in an attempt to destroy the local fog condensers.

Appearances
Fog Crawlers appear only in Fallout 4 add-on Far Harbor.

Behind the scenes

 * Its model is similar to the Chaurus, a hostile insect from Skyrim, a game also developed by the developers of Fallout 4, Bethesda Game Studios.
 * It also resembles the arachni-lobster creature from Stephen King's novella The Mist, which also dwells in a fog. Like the Far Harbor DLC, The Mist takes place in Maine.

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