Because of his skill, many people flocked to Ferris from all over in search of his medical expertise.
He is known as the Beast of the End and is the current Great Spirit of Fire.
That being said, practitioners of water magic were still able to generate and manipulate water and ice, although Ferris himself never displayed the ability to do so.
There were however a couple of known afflictions that not even Felix could heal including the illness that felled the entire Lugunican Royal Family and the infection caused by 's corrupted blood.
Unlike the other men who served as the personal knights except of the other candidates for the throne, Ferris was not a capable combatant worthy of defending his master.
He is the only one besides Beatrice that knows this skill , though Reinhard has shown a similar ability at the end of Arc 1.