As a reaction, which you take when you are hit by an attack you can see or taking force damage, an invisible barrier of magical force appears around you. Until the start of your next turn, including against the triggering attack or damage, you have a +4 bonus to Defense and resistance to force damage.
You can expend 1 additional mana or psi to increase the bonus by 2.
You can expend 1 additional mana or psi to trigger the spell when a creature that you can touch or see within 18 meters is attacked. The attacked creature gains the benefits instead.