Detect Interference

The meddling of lesser beings cannot be allowed to continue.
You cast your senses out into the universe, seeking to detect the magical emanations of other spell-casters, energies from beyond the Material Plane, or other eldritch powers. Whenever a creature within 300 feet casts a spell, you are aware of the level of the spell and the school of magic. You are aware of the starting and ending location of any teleportation within 200 feet of you. Whenever a creature that is not native to your current plane enters the range of this spell, you become aware of their plane of origin, general direction, and approximate distance.