Brief History:
Tellah's life was devoted to magic, and studying scrolls to learn forgotten spells of ancient times. He left Mysidia when an incident happened in his youth that caused many citizens to be injured. He moved to Kaipo and eventually married an ordinary woman who bore him his daughter, Anna. As he aged and forgot many spells and his wife passed away, Anna became his reason for living...

In Battle:
In battle, Tellah's magic makes him an asset at first. But once Palom joins your party, you'll find out that Tellah's magic is a little weak (probably due to his old age.) His attack is very worthless, as it will almost always miss (or hit for extremely minimal damage.)

Special Attacks:

Black Magic
When he first joins your party, Tellah will only remember a few black magic spells. But once he is in the presence of the light atop Mount Ordeals, he regains those spells which he had forgotten and has access to all the black magic spells (except Meteo).

White Magic
When he first joins your party. Tellah will only remember a few white magic spells. But once he is in the presence of the light atop Mount Ordeals, he regains those spells which he had forgotten and has access to all the white magic spells.

Remember
Tellah attempts to remember a spell he has forgotten and cast in on an enemy/ally. Not always effective. Disappears after he is in the presence of the light atop Mount Ordeals.