As a reaction, which you take when you are hit by an attack that you can see, you can shrink in size to avoid the attack. Until the start of your next turn, including against the triggering attack, you have a +4 bonus to Defense. You can then move up to 1.5 meters without provoking opportunity attacks.
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 see within 18 meters is attacked. The attacked creature gains the benefits instead, but cannot move as part of the reaction.