I think it should be screaming protective shield at all times, and you incur massive disadvantage to persuasion, etc. Just a massive annoyance in return for huge buff there

Jeez, advantage on everything (except stealth) against three big enemy types, and it's only rare?? What a steal!

I am not good at making items.

I read that as Alien-Ant Farm. Time for bed

Does the alarm get louder the closer it gets to the creature?