Greetings and welcome to the game, enjoy your stay, Hale Nalu.
As for Athelas, unfortunately there aren't any dedicated magic user units, the closest thing would be the Enchanters, of which the Alpine Elves give +25% Damage to. If you like using magical abilities, I strongly suggest choosing the Archmages trait during faction creation, as it gives Enchanters a sizeable bonus to Damage and Armor, and gives all your military units +100 Stamina.
That is a huge boost, for every single unit, as Elven units tend to use Stamina a lot. Any aspiring Elven Player should heavily consider this trait, along with the Forest Warrior one; as shiny and neat bonuses to income might look, they matter less than having a strong military force, which the Forest Warrior & Archmages traits provide.