Magical protection spells are varied and powerful. Some can negate a single attack, some can stop up to a certain amount of damage, some can prevent all attacks of a certain type. His original protection spell was a general one, reducing damage from all forms of attacks, Physical Barrier is a much stronger barrier that only works on Physical attacks. Ethereal Shift is a much more powerful anti-physical spell. Making physical attacks pass through the target as if they weren’t there.