Arcane Barricade

You create a barely visible, immovable, impassable barrier of magical force that stretches across a narrow opening, such as a corridor, window, or doorframe. The barrier is 1 inch thick (2.5 cm) and adjusts its dimensions to fit the opening it’s placed in (up to 10 ft by 10 ft [3 m by 3 m]). It is barely visible, meaning a successful Perception check against your spell save DC can reveal it. Any form of physical or magical interaction with the barrier reveals it. Physical objects, creatures, or spell effects cannot pass through the barrier. The barrier can be dispelled by spells such as Dispel Magic or Disintegrate. It can be suppressed with Knock for up to 10 minutes; if the remaining barrier duration is shorter, it is dispelled. The barrier can be destroyed if it receives at least 25 points of damage within a single round. It is resistant to all non-magical attacks and immune to poison, psychic, and necrotic damage. The barrier has an AC of 8 + your spellcasting modifier. Casting this spell in a doorway, for example, reinforces the structure, so attempting to destroy the doorframe counts as attempting to destroy the barrier itself.

You and any creatures you designate when casting the spell can, at will, suppress the barrier for 1 minute by touching it and willing it to do so.

The barrier can be made permanent if cast using precious metal or gem dust worth 10 GP (+ 10 GP per spell level above 2nd), which the spell consumes.

At Higher Levels: For each spell level above 2nd, the damage needed to destroy the barrier increases by 25 HP. At 3rd level, the duration is 10 minutes; at 4th, 30 minutes; at 5th, 1 hour; at 6th, 10 hours; at 7th, 24 hours; and at 8th and 9th levels, the barrier is permanent, requiring no material cost and cannot be destroyed by dealing damage.