Leona is an adventurer (read under "thief") that is searching with her friends for The Seven Stones
Of The Universe, a Legendary artifact that holds the power to bend the laws of reality and make anything possible. She's seeking that power to bring an old friend of hers back to life. During her searches, she doesn't mind getting as many treasures as she can. While she may look despotic, and treat her friends as subordinates, in reality she really cares a lot about them and their friendship.