Ludina, also known as the Ice Witch, is a supporting character in Witch Spring 2. Her subplot is optional starting in Chapter 3 and so it is completely possible to never meet her in the game.
Long before the start of the game, Ludina was the first half-blooded deity to become Temple Lord. However, at one point, she ended up destroying her village and became feared as the "Ice Witch." She left her infant daughter, Luna, in Aramute's care before sealing herself away in the Ice Cave as penance.