Wall of Rune Warding

Tracing a sigil in the air, you weave a wall of warding energy at a point you can see within range. You can make the wall up to 30 feet long, 20 feet high, and 1 foot thick. The wall appears as a sheen of shimmering arcane runes, and lasts for the duration. The wall does not have to appear in a straight line, but it must be contiguous.

The warding runes will attempt to destroy or otherwise deflect any magic that attempts to harm you or your allies. Spell attacks that pass through the wall are made with disadvantage, and if the wall is between an allied creature and a harmful effect that requires a saving throw, that creature has advantage on the saving throw, unless the effect originates from yourself or one of your allies.