Elf Wizard (Level 1)
The Wizard has a Magical Attack of +2, and is a light source of 1.
Elf Sorcerer (Level 2)
The Sorcerer has a Magical Attack of +3, and is a light source of 2. Additionally, as a Spoils effect, he can remove a monster from the dungeon hall before restocking it.
Elf Archmage (Level 3)
The Archmage has a Magical Attack of +4, is a light source of 2, and can remove a monster from the dungeon hall as a Dungeon: ability, placing it under the dungeon deck. Additionally, it is worth 2 Victory Points.
Rulings and Errata
The Efl has been given the Elf race by the Thunderstone Compatability Guide