You conjure a shimmering, 10-foot-by-10-foot vertical portal that acts as an impenetrable dimensional shield. You can place the portal anywhere within range, and it does not need to be anchored to the ground.
Any physical attack (such as melee weapons, arrows, or falling debris) or targeted spell that passes through the portal's space is instantly swallowed by the void and ceases to exist. Area of effect spells cannot pass through the portal; they wrap around its edges.
As a bonus action on your turn, you can move the portal up to 30 feet to a new location within range. Creatures can move through the portal freely if they wish, but they are instantly teleported to a random location within 1d100 miles and suffer 10d10 force damage from the turbulent dimensional shift.
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