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Marta Lualdi  is the daughter of Brute as well as a former member of the Vanguard. She lost her mother during the Great Kharlan Tree's rampage in Palmacosta. A bit of a tomboy, Marta is passionate about getting her way. On the left side of her forehead lies the Ratatosk Core, which is later revealed to be a fake core that Ratatosk placed on her to draw attention away from himself and towards Marta. Emil becomes a Ratatosk knight in order to protect her and the Ratatosk Core. She views him as effeminate, but believes he possesses a hidden strength. 

Source from Wikipeida