FFXI Final Fantasy XI Paladin
Paladin leveling guides and strategies are all available at Skryer.
A Paladin specializes in close-range combat, just like warriors. However, through long hours of spiritual training, paladins have acquired the ability to cast white magic spells, making them even more valuable on the battlefield.
The Paladin has invincibility which has several purposes. Obvioustly, it protects your character from physical harm like few others. In a pinch, you can use Invincibility to negate lots of damage while going after opponents with magic.
However, a more interesting note is the secondary effect of Invincibility. This power causes monster to despite you, even if you aren't causing a lot of damage on your own. When a group is in trouble and your party risks losing one of its members, this pulls the attention off other Warriors or party members and places it back on your character. Plus, healers and nukers will need that freedom to start spamming their spells while restoring the balance of the fight.