Mona (Artemis) is a 4 stars Flow Fighter esper in Dislyte.

Artemis Mona is a free unit given right at the start and thank goodness! First of all, she is a very good farmer and can help level your other characters once she gets going. I suggest giving her the best attack or lifesteal set given to you (upgrade them to +12) in chapters 6 and 8 to make sure she can clear maps by herself with 4 other fodders or weaker units.

This is very valuable as she can clear maps faster than most units and thus fast leveling. She is extremely self-sufficient with her skill 2 healing herself as well. Lifesteal set is not mandatory but the free gear is good since it gives Crit Rate and Atk% bonus.

Making her your first 6 star is highly recommended, even ahead of any 5 star rarity heroes you might have pulled initially. Having her being able to carry your entire team and level quickly is too good to pass up. With high enough damage, she can one shot units with skill 1 and gain an extra turn. This snowballs and allows you to cycle your skills quickly. The AI is also decent in auto as well. And early on, she is vital in getting you to Kronos 7, which is the first level where you can find 6 star grade equipment.