Storm Tower

You form an enormous tower of dark, swirling storm clouds and howling wind.   A storm tower absorbs any electricity damage dealt to those within it. Magic missiles cannot be cast into, out of, or within a storm tower. The storm tower is composed of windstorm-strength winds (DMG 95), making ranged attacks impossible within it, though it has no effect on the movement of creatures within it. However, only Gargantuan or Colossal creatures can pass through the outer edge of the storm tower; all creatures of smaller size must succeed on a Fortitude saving throw to enter; otherwise, they are checked at the edge.   Anyone within a storm tower has concealment relative to those outside the tower. The howling winds of a storm tower also apply a -10 penalty on Listen checks made within 50 feet of it (including all those made inside the tower).
 

You conjure a 100-foot-high, 20-foot-radius cylinder of dark, swirling storm clouds and roaring winds at a point you can see within range. The storm tower creates the following effects:   Electricity Absorption: Creatures inside the storm tower are immune to lightning damage.   Magic Missile Block: Magic missile spells cannot be cast into, out of, or within the storm tower.   Howling Winds: The interior of the storm tower is filled with windstorm-force winds.   Ranged attacks made into, out of, or within the tower automatically miss.   Creatures of Huge size or smaller must succeed on a Strength saving throw when they try to enter the tower or start their turn at its edge, or they are unable to enter that round (their movement is stopped at the edge).   Gargantuan or larger creatures may enter freely.   Concealment: Creatures inside the storm tower have lightly obscured vision against creatures outside it, and vice versa.   Deafening Roar: All creatures within 50 feet of the tower (including inside it) have disadvantage on Wisdom (Perception) checks that rely on hearing.   At Higher Levels. When you cast this spell using a higher level spell slot, increase the tower's height by 20 feet and its radius by 5 feet for each slot level above its base level.