Ensanguined Emissary

You implant a message within a severed head, a message that is uttered whenever a Small or larger creature enters its range. Choose a head which has been separated from its body. Then speak the message, which must be 25 words or less, though it can be delivered over as long as 1 minute.

Any creature approaching within 5 feet of the severed head will trigger the spell. When triggered, the eyes of the severed head will flutter open and focus on any creature adjacent to it before reciting the message in your voice and at the same volume you spoke. When you cast this spell, you can have the spell end after it delivers its message, or it can remain and repeat its message whenever the trigger occurs.