Magic god battles + ice... This is going to look fantastic in my head...
Anyways, going by Deamon's idea of a place the deities (I'll just call it gods from now on, I always forget the word deities and have to look it up over and over again) and, me being the ultimate sucker for Greek and Egyptian mythology. I can't remember anything Egyptian (Hieroglyphian) but on the Greek side, there was a bit more to pick from. There are several, but the most central was Boreas, who was the god of the Northern Wind. He had several children, the most commonly mentioned was Chione, who controlled snow (Under her father's command). The histories never denied that he had several children as far as I know, and I haven't found anything denying it while researching. Boreas was also known for being aggressive and short-tempered, which could be a possible reason the twins were sealed off.