Galantha Nival
From DQWiki
She's a halfling female ice mage. This much is true. Her name, which is elven for Snowdrop, may be true. She claims to have come from way up north, which, given her skill set may not be true. She claims to have seen the Northern Lights on Alusia and gone freediving under ice, which may be true as she has vivid memories of doing this, but maybe this wasn't on Alusia.