In the militaristic Noxas, it is believed that the first duty of a woman is to raise strong children and carry on the family line for her husband who joined the army. But some women don't take parenting as their nature, and Katrina is one of them. As the daughter of the venerable Noxas general Du Dikko, Katrina is more interested in her father's knife than the skirts, jewels and trifles that her sisters care too much about. A quarrel in childhood soon exposed Katrina's terrible killing ability, and her opportunistic father was willing to cultivate her killing instinct.

Under the training of the best assassins in the polis, Katrina showed her assassination skills for the first time in the Ionian War. There, her mastery of the sword and her cruel character won her the title of "ominous blade", which will accompany her all her life. However, she is famous for her achievements in the activities against Demassia, especially those about her engagement to the national hero Galen. Galen became her competitor when she found Thain's bones in the vanguard.

When Valoran's rare peace replaced war, Katrina could only find the temptation of violence in the only remaining paradise-League of Legends. Some people may think that the path chosen by Katrina will inevitably make her an alliance hero, continue to carry out the will of Knoxas and bring prestige to her noble family. But there, she continued her cruelty-both respected and abused. Horrible and adorable.

Galen Galen said after a small-scale battle: "Nokas ominous blade is like a black widow-beautiful but deadly."