The Dark Elf Fencer is an elven monster that patrols Enrika. She is the first elf encountered in the game, albeit one which has fallen from grace due to devoting their mind, body, and spirit to depravity.
She is also capable of using a sword, hence her name, however Luka easily sees through the ruse as a ploy as she goes on to using various pleasure attacks. Because she has fallen to darkness she also holds some dark seductive powers, using her kiss to enrapture men before using her tainted body to corrupt them and make them just like her, devoting themselves to carnal desires after their soul has been sucked out by her genitals.
She confronts Luka seemingly to turn him away from Enrika, as does the Dark Elf Mage after her, only to be sealed and shrinks into the size of Luka's palm. Despite her dark disposition, she is a guardian of the town. In Chapter 3, after Ilias's army is repelled in Enrika, Luka encounters her in the town. She explains that she helps protect the town in order to repay Micaela for allowing her to stay, even after falling into darkness.