Illusionists use the power of the elements to deal a decent amount of damage to all enemies on the battle field. Because all of their abilities "Target All" enemies, the Illusionist can stay out of the fray and cast magic. Since they have mediocre HP growth (and outstanding MP and Magic Power growth), it is advisable to move out of harm's way at each and every turn.
Human Illusionists have the highest MP and Magic Power of any Human job, and have exceptionally high Resistance as well. However, this is counter-balanced by having the lowest HP, Attack and Defense stats of all Human job, as well as being the second slowest, beating out the Paladin by only a tenth of a point. Like all Human magic jobs, it is faster but slightly less powerful than its Nu Mou counterpart.
The Nu Mou Illusionist holds the honor of having the lowest HP growth in the game, as well as tying with Paladins, Templars and Sages for the lowest Speed growth. The Illusionist does not have any beneficial unique merits, as the Alchemist, Time Mage and Sage outshine it in almost every aspect.