Vana'diel Bestiary: Rime Gigas  

I have received the Magnolia rare Drop from this monster two times in the area near the pond (I-7) in Beaucidine Glacier. the drop has happened on other gigas mobs in tat area too, so don't count them out either. This one has just been my most successful for drops

Also note (before you think it's easy) that i have only been able to get one drop a day with roughly 4 hours of farming each day.