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Author: Trueblade Z
Monster Class: Elder Dragon
Monster Name: Fatalis
Picture:

In-Game Description:
A legendary black dragon said to have prowled these lands from the days of old. Many skilled hunters have sought to challenge it, but none ever return. A monster shrouded in mystery...
Information:
Few have seen the Fatalis and even fewer have lived to tell of it. The only monster able to scare a Lao Shan Lung it is a violent creature and will protect its territory. The Fatalis is known for its One hit KO moves which it is named for. There are three species of Fatalis and all are equally deadly. The black Fatalis mainly lives in the ruins of Castle Schrade. The Black Fatalis is the only creature that is fought in the Castle so it is most likely that Schrade's destruction is due to the Elder Dragon. The Guild has equipped the castle to allow hunters to fight the Fatalis with siege weapons. Though large and deadly, a skilled and fast hunter can bring down a Fatalis with a bit of work. Be warned of the Fatalis' Snap and Drag attack. It is advised that when fighting the Black Fatalis to never face him directly due to most of its attacks are frontal attacks.
Primary Habitats: Castle Schrade
Nicknames: Fata
Titles: The Embodiment of Evil and Disaster, The Legend of Schrade, The Legendary Black Dragon
Type: Canon and Fanon
Source: http://monsterhunter.wikia.com/wiki/Fatalis

Author: Trueblade Z
Monster Class: Elder Dragon
Monster Name: White Fatalis
Picture:

Credit to whoever made this. Found at Monster Hunter Wiki
In-Game Description:
None. See Fatalis and Crimson Fatalis
Information:
The final of the Fatalis' the White Fatalis is known as the strongest of the three and rightly so. The White Fatalis, like the Kirin, can produce electricity at ease and control it at will. While a ranged Hunter can avoid almost all of its ground physical attacks, its lighnting storm attack can hit anywhere and will kill anyone without the guts skill on their armor. Like its brothers, the White Fatalis chooses one area as its home and dominates it. Like its Crimson brother, the White Fatalis shares its domain with other monsters but when a White Fatalis is around, no other monsters dare to approach. The White Fatalis is known for its "Armor Mode" where its defense skyrockets and only weapons with Pierce (Ranged) or ESP (Melee) can attack. The White Fatalis is called the strongest Elder Dragon. White Fatalis armor is famous for its myriad of unique skills that only it can give.
Primary Habitats: Tower
Nicknames: White Fata, Grandpappy Fatalis, White Fatty
Titles: Ancestral Dragon
The Embodiment of Ancestry and Purity
Type: C/F
Source: Monster Hunter Wiki