Corpse Stronghold Abyss Shellder

The **Corpse Stronghold Abyss Shellder** was an Irregular UBM that lived in the Southern Seas.

## History

Abyss Shellder was originally a UBM living in the sea around Legendaria with the ability to gain the powers of creatures whose corpses it had eaten. It was transported to the Southern Seas via a Fairy Circle, where it came into contact with a UBM with the Pearlization ability. During the fight, Abyss Shellder managed to eat parts of the enemy's body and acquired a downgraded version of the Pearlization ability, allowing it to transform the defeated UBM's corpse into a pearl and devour it, gaining the perfect version of the Pearlization ability.

After this, Abyss Shellder devoured many aquatic monsters and UBMs, and acquired their abilities and raised its level. It also discovered an undersea deposit of Mythril Arms Slimes and devoured them, gaining a huge amount of Resources, the ability to divide itself, and powerful resistance skills.

## Plot

### Southern Cross

Abyss Shellder appeared in the Southern Seas area, where it created its own territory and began disrupting the trade routes in the area, by destroying multiple ships from the merchant fleet and their escort vessels from the military fleet.

It even destroyed the punitive unit mustered by the captain of the adventurer fleet, Jonathan Grafront which included the elite vessels of the adventurer fleet, along with multiple high ranking Masters, including a Superior.

Soon after it was trapped in an underwater cage created by Ursula, where it engaged in a fierce battle with Shu Starling while its duplicates were destroyed by the combined fleet made up of Granvaloa's four fleets, Granvaloa's Great Seven Embryos and the Sea Dragon King, Drag-Stream. After losing its indestructible metal shell, it was destroyed by the Adventure II which was commanded by Liara Grafront.

## Abilities

A mix of a pure performance UBM and specialized skill type UBM, Abyss Shellder possessed an END of over 200,000. By carefully selecting skills that were beneficial to it and keeping those within the main body and transferring other skills to its duplicates, Abyss Shellder possessed powerful resistance skills that could negate nearly all forms of damage, making it virtually invincible.

### Duplicates

Abyss Shellder also had thousands of duplicates with power ranging from the Pure Dragon tier to Ancient Legendary UBM equivalent. These duplicates could all use **Supplement Absorption** and **Pearlization**, and possessed skills Abyss Shellder deemed unnecessary for itself, including the special abilities of UBMs. If they absorbed an ability Abyss Shellder deemed useful, they were reabsorbed into the main body. All the duplicates had names beginning with **Abyss** and were all destroyed upon the death of the main body.

* **Abyss Mail Kraken**: A Pure Dragon tier monster that has tentacles and a metal shell.
	+ **Ice Breath**: An ability absorbed from a **Frost High Serpent**.

* **Abyss Albatross Shark**: A Pure Dragon tier monster that appears a shark the size of a megalodon with wings.

* **Abyss Scale Kong**: A Pure Dragon tier monster that appears a hybrid between a gorilla and a fish. It is relatively smaller than most other duplicates.

* **Abyss Out Wing**: A monster equivalent to an Ancient Legendary UBM. It appeared as a mix between various creatures. Due to its skills, it was used as air defense for the main body. It was destroyed by Mode Edwards.
	+ **Barrier**: A skill originally from a certain UBM. It can create a barrier used for attack and defense.
	+ **Supersonic Flight**: Out Wing could fly at supersonic speeds.

* **Abyss Alchemist Titan**: A monster equivalent to an Ancient Legendary UBM. It resembled a fusion between a gorilla and fish. It was destroyed by Miroslava Swampman.
	+ **Armour Creation**: A skill originally from a certain UBM. It could create metal armour from seawater. The armour was slightly weaker than Mythical metal but could withstand water pressure of up to 7,000 metels.

* **Abyss Blast Dragon**: A monster equivalent to an Ancient Legendary UBM. It resembled a cyborg. It had weaponry Abyss Shellder acquired from undersea ruins from the pre-ancient civilization, such as a laser cannon and a charged particle cannon. It was destroyed by Sea Dragon King, Drag-Stream.
	+ **Automatic Repair** (自動修復): Details unknown.

### Skills

**Supplement Absorption** (補食吸収): A passive skill that allows Abyss Shellder to absorb the Resources and skills within any corpse it eats. Because of the drop item function installed into all monsters upon death by Queen which caused monsters to not leave any corpse for it to eat, this ability was deemed useless by Jabberwock.

**Pearlization** (真珠化): A passive skill that allows Abyss Shellder to give the status effect **Pearlization** to a target that has touched the liquid it produces and turns their body into a pearl like substance. Once killed, monsters affected by this ability do not become drop items and their Resources remain inside their body.

**Liquid Life Form**: A passive skill that allows Abyss Shellder to increase its volume, render physical attacks mostly ineffective and removes the need to intake oxygen. In Abyss Shellder's case, this only applies to its liquid metal shell and it must absorb certain metal type monsters in order to regenerate the shell.

**Duplicate Creation**: A skill that creates a space where it can create duplicates of itself that can use **Supplement Absorption** and **Pearlization**. Abyss Shellder can transfer abilities it has deemed unnecessary for itself into these duplicates, and in the event that the duplicate absorbs an ability Abyss Shellder desires, it can reabsorb the duplicate and absorb that ability.

**Flame Negation** (炎熱無効): A passive skill that negates flame attacks. It only works on Abyss Shellder's liquid metal shell.

**Lightning Negation** (雷電無効): A passive skill that negates lightning attacks. It only works on Abyss Shellder's liquid metal shell.

**Magic Negation**: A skill that negates attack magic. It only works on Abyss Shellder's liquid metal shell.

**Damage Decrease** (ダメージ減少): A passive skill that reduces all damage taken by a certain percentage. It does not work on damage Abyss Shellder inflicts on itself and internal damage.

**Damage Reduction** (ダメージ軽減): A passive skill that renders all damage below a certain value to 0.

**Regeneration**: A skill that regenerates Abyss Shelder's body and HP at ultra high speeds.