It is a physical-skilled monster that resists weapon attacks well, but is otherwise not that dangerous. Using Leviathan, Bahamut, or casting Bio on them will help with defeating them much quicker. They have high Attack, so casting Cura each round is advisable.
They are semi-strong foes that normally only use physical attacks, but when alone will counter any damage dealt to them with Leech to restore varying amounts of HP. Bio and Quake can dispatch them with ease.
Fell Knight appears as an enemy.