Encapsulate

You create a shimmering barrier of translucent magical energy. Creatures on one side of the barrier may not be targeted by ranged attacks made by creatures on the other side, and creatures cannot subject creatures on the other side to a magical effect. The barrier may take 2 forms, as seen below.

Wall. The barrier takes the shape of a wall that extends up to one mile high and two miles long. This must be in a straight line.

Sphere. The barrier takes the shape of a sphere with a radius of up to one mile.

The only way to dispel this effect is to cast dispel magic on the point at which the sphere is centered.

By casting this spell on the same spot every seven days for a year, it lasts until dispelled.