Barrier

You create a Barrier, a golden Dome barrier of translucent magic power. The Dome appears within range on a solid surface and lasts for the duration up to 5m of your choice. You make the Dome with a radius of up to 20 feet and 20 feet high, and 1cm thick thick or a wall that has a 20-foot diameter and is up to 20 feet high and 5 feet thick. The wall blocks line of sight.

Each creature that trying to pass through the barrier must make a Dexterity saving throw. On a failed save, a creature takes 2d8 damage and is sent back 10 feet.A creature can move through the wall, albeit slowly and painfully. For a creature to move through the wall, it will take an amount of turns equal to 6 - there strength modifier, if out of combat they have to beat a strength roll equal to the casters spell casting DC.

Nothing and be cast through the barrier and weapons cannot be fired through, a simple spell but quite unbreakable.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increase by 1d8 for each slot level above 3rd. when a slot of 6th level or higher is used the barrier is solid and cannot be passed through.