Detect Comprehend Languages

For the duration, you sense the presence of the spell Comprehend Languages if its within a 5 ft radius of you. If this spell detects the spell Comprehend Languages, a booming voice targets up to 4 creatures of the DM's choice within at least 300 miles of you and informs these creatures that the spell Comprehend Languages has been cast and detected by this spell. The voice, volume, and tone is up to your DM's digression. 

The spell cannot detect the spell Comprehend Languages if any material thicker than one inch is between you and the person casting the spell. The voice that is cast will pass through any and all material to seek out that person. Upon completing the casting time required, if you detect the spell Comprehend Languages, you must make a DC 5 Constitution save or take 1d100 force damage.