The Black Magician Trilogy Series by Trudi Canavan

Summary:

The Black Magician Trilogy by Trudi Canavan is a fantasy series about Sonea, a young girl from the slums who discovers she has magical abilities. As she navigates the world of the Magicians' Guild, she uncovers dark secrets, faces prejudice, and becomes entangled in a battle against a dangerous, forbidden magic.

The Magicians' Guild
Sonea accidentally reveals her magical powers and is taken to the Magicians' Guild, where she must learn to control her abilities while facing prejudice and danger.

The Novice
As Sonea trains to become a magician, she battles discrimination and uncovers a forbidden practice of black magic within the Guild.

The High Lord
Sonea confronts the truth about the High Lord's use of black magic and joins him in a fight to save the city from a deadly enemy.