The White Armors are empty suits of full plate armor that have been animated with limited intelligence to attack. They have also been given the ability to be area effect spell suckers. On top of all that they use that area effect magic to heal themselves. As far as one on one magic attacks, personal enhancements and so on they do not counter.
Basically any spell that covers an area when used attack or not will be sucked up by them.
As for damaging them they can only be harmed by blunt type weapons, which include items & spells that cause blunt damage. Case in point Ring of the Ram / Spiritual Hammer.
Hope that helps everyone understand my creations
