White Magi

From LSWiki

White Magi is DEAD! R.I.P. It isn't here anymore. Don't bother looking for it in-game.

A good/order guild of magi of the cold/ice preferences.

Although I'm sure someone will correct me if I'm wrong...

I don't think these are currently playable.

I think you're looking for Ordo Verbus Glacialis.