Delilah's Dome of Protection

A 20-foot-radius immobile dome of force springs into existence around and above you and remains stationary for the duration.

Up to 8 creatures of Large size or 16 creatures of Medium size or smaller can fit inside the dome with you. The spell fails if its area includes a huge or larger creature or more than 16 creatures.

Nothing--not physical objects, energy, or other spell effects--can pass through the barrier, in or out, though a creature in the sphere can breathe there. The sphere is immune to all damage, and a creature or object inside can't be damaged by attacks or effects originating from outside, nor can a creature inside the sphere damage anything outside it. The atmosphere inside the space is comfortable and dry, regardless of the weather outside.

Any time the dome is targeted by a magic missile spell, a line spell, or a spell that requires a ranged attack roll, the effect is reflected back at the caster as though it originated from the dome, turning the caster into the target.

A single drop of blood from a close friend or relative of the caster that touches the dome dispels it, or a disintegrate spell targeting the dome destroys it without harming anything inside it.