Particular question for Guardians:

They have a complete immunity to magic (Including beneficial ones). Is it a small aura-like energy that bends the weaves of magic a few inches off of a Guardian? Is it purely their bodies and not an aura? Is it only contact with direct magic that will be cancelled/rendered useless? Does standing near a mage (even friendly) do anything to them?

I ask this as it will change the dynamic of how Nyirr (And probably other Guardians) fights and handles a situation.