Fatalis is the end-game Large Monster for Monster Hunter. He could only be fought online in the original Monster Hunter. The setting is at night in Castle Schrade. He is one of the three Elder Dragons in the original Monster Hunter, the others being Lao Shan-Lung and Kirin. The first of the Fatalis brethren.
To unlock Fatalis, in Monster Hunter, all online quests from 1* to 6* have to be completed and it is believed that 100 large monster kills was also needed.
For Monster Hunter Freedom 2, undertake all Training School Battle Training quests, 1 weapon per creature in the special quests, and 1 weapon per creature in the group quests(which can be beaten solo), then unlock HR6, and speak to the 2nd Guild Lady to accept the quest.
Fatalis is fought in front of the gate of Castle Schrade.
Fatalis has two new attacks reminiscent of the fire dragons Teostra and Lunastra. It now has a flame breath attack with extended range compared to the fire dragons'. It also can release reactive powder around its general vicinity and ignite it, causing a large explosion to occur.
Its health has been reduced from previous iterations to compensate, though it will still flee after a certain threshold of time and damage is surpassed.
Fatalis' head may be ridden in the manner of most other monsters backs.