As two actions, a shimmering barrier extends out from you in a sphere and moves with you, remaining centered on you and hedging out creatures other than undead and constructs. The barrier lasts for the duration. Any creature within the barrier when you cast the spell is pushed outside the barrier.
The barrier prevents an affected creature from passing or reaching through. An affected creature can cast spells or make attacks with ranged or reach weapons through the barrier.
If you move so that an affected creature passes through the barrier, the spell ends.
You can expend 1 additional mana to cast the spell centered on a point within 20 meters.