Blocking Spell Mastery

Blocking Spell Mastery is found on pg 23 of GURPS Thaumatology: Magical Styles and modifies Blocking Spells to use the Multiple Blocks rule. Although it must be spell-specific, they all count as 1 shield for accumulating penalties.
allows All-Out Defense "Dedicated" bonus to apply, unclear if "Double" was already an option, not specified
Category:Perks