Everyone can build a wall and have it stay there for a boring, long time, everyone can pop up a barrier protecting them and forget about any trouble, but, why limit yourself over doing this once? Why not constantly pierce your enemies with walls of pure frost and ice?

As part of the action when you cast this spell, and as an action on each of your turns until the spell ends, you create a wall of ice on a solid surface within range. You can make the wall up to 25 feet long, 10 feet high, and 1 foot thick, which vanishes at the start of your next turn or when you make a new one. You can use a bonus action on your turn to increase the wall's duration by one extra turn, provided that it hasn't been breached.

When the wall appears, each creature within its area must make a Dexterity saving throw. On a failed save, the creature takes 3d6 cold damage and 3d6 piercing damage, or half as much damage on a successful save.

The wall is an object that can be damaged and thus breached. It has AC 12 and 25 hit points, and fire damage instantly destroys the wall. Reducing the wall to 0 hit points destroys it and leaves behind a sheet of frigid air that stays in the space the wall occupied until the start of your next turn. A creature moving through the sheet of frigid air for the first time on a turn must make a Constitution saving throw. That creature takes 2d6 cold damage on a failed save.

At Higher Levels
When you cast this spell using a spell slot of 6th level or higher, the damage increases for each of its effects by 1d6 cold damage for each slot above 5th.