Ward Against Eavesdropping

You ward the area you are in against eavesdropping from those outside the area. Choose an area  up to 10 feet in diameter, and everyone inside that area can hear each other normally, but cannot hear what's outside. Everyone outside cannot hear anything from inside. The ward is stationary and does not move with the caster. Attempts to eavesdrop with magic are detected by the caster, though not the location of the attempted eavesdropper, just that an attempt was made.

The area of spell increases at higher levels. It increases by 10 feet in radius for every level starting at 2nd and above