Berserker

Appearance
The Berserker is an enormous, warship-sized crab that can grow up to 250 meters in width. They commonly have 4 claws as opposed to the naturally-occurring 2 of regular crabs. These claws are strong enough to crush the armor of warships, buildings, and most other structures with little resistance.

While the stratified shell of a Berserker is jet black like most Grimm, it is covered in a rough, easily chipped layer of white ablative armor on both the top and bottom of the body. This layer is capable of regenerating over a matter of days and is what makes the Berserker such a deadly foe in combat.

Berserkers are a sea-faring Grimm and prefer to live in shallow waters, but have been found in deep ocean. To attack ships this way, the Berserker most likely possesses Swim Bladders like normal fish.

Special Traits
As mentioned earlier, the Berserker's main means of defense is its thick layer of ablative armor on top of hardened strata. Its size means it can only be realistically fought by full-size warships with hunters as distractions or tactical assets. The outer layer easily absorbs or deflects many shells and other forms of ordinance. Even when the armor is completely stripped off through sustained fire, the flat shape of the berseker and its thick stratified shell make penetrations very difficult.

Bersekers themselves are fully aware of the defensive power granted by their armor. Elder examples have been observed to fight and destroy until their ablative layers have been nearly stripped through. Upon feeling a direct impact on their shell, the creature will retreat to fight another day.

Weaknesses
For the most part, it is far easier to drive a Berserker off than it is to kill it. Driving off a Berserker requires only nerves of steel and a whole lot of ammunition. Killing a Berseker requires speed and precision; exactly what the creatures lack. Agile attackers like destroyers, PT boats, or hunters can evade their enormous, ship-breaking claws to deliver sustained fire to rapidly take down their ablative armor. High-velocity shells, bunker busting missiles, or even certain specialty weapons must then be immediately delivered on target where the thick and heavy armor of the creature will contain the explosion, killing it instantly. Guided ordinance works best if only because it can adjust the angle of approach to better ensure a penetrating hit.

For hunters that do not have access to a ship or a ship that does not have access to high-powered armor-piercing weapons, the joints of a Berseker lack the armor of its body and limbs. Well-placed shots or slashes have a decent chance of cutting through the connective tissues holding it together. By stripping off limbs, an opening can be created where even standard caliber shells can deal damage.