You create a 30-foot radius sphere of translucent light centered on you. The walls of light of the arena thus created are 1 inch thick, don't move with you when you move and don't block the lines of sight; but creatures inside the arena can't target things outside of it with spells or attacks.
Moreover, when a creature inside the arena tries to move through the walls of the arena, it must succeed a charisma saving throw or it stays inside the arena and becomes restrained until the start of its next turn.
Effects that would push or pull a creature that is inside the arena can't push or pull it through the walls of the arena, as if they were solid walls.
If the walls of the arena should appear on the space of a creature when you cast the spell, that creature is pushed outside of the arena on the nearest free space.
* - (a pinch of sand)
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