You create a 15 ft. radius spherical transparent barrier centered around you, which is immobile after being created and lasts until the start of your next turn. When an attack or ability originating from outside of the barrier would affect anything inside of the barrier, it gets sent to the aetheric realm, and everything under the barrier is kept safe.
(It may affect creatures just outside the barrier, and creatures in the aether realm, but at least it will not affect you.)
(Incorporeal creatures cannot be protected by Banishing Barrier.)
Creatures can pass through the barrier without issue, and the barrier offers no protection against attacks or abilities originating from within it.

Interference:
If multiple Banishing Barriers overlap, they merge into a single new Banishing Barrier where anything that is inside one of them is inside all of them.

Banishing Barrier shatters if it prevents 100 damage or more from a single attack or ability. Those inside still take no damage from that attack or ability.

Suggested Backfire: The area fills with elemental power, dealing 1d6 damage to everyone within, or your spellburn die size decreases.