Imp Collar - Weird Magic Item #1

Inspired by the incredibly excellent Weird Magic Item generator over at Donjon.bin.sh, I've been coming up with a few of my own system agnostic weird magic items to put in the many games I run, be they 13th Age or Beyond the Wall...

Eventually I want to try and put them into a randomizer, but I need to generate a few first. I'm going to try and post one every other Wednesday. Please let me know if you end up using an item I've created in your own game. You can find the entire series here...

Antagonist Relations Weird Magic Item Generator Presents...

Imp Collar

This collar is always found around the neck of a skeleton, it appears as a heavy iron collar around the skeleton's neck attached by a sturdy chain to a smaller collar. When a living being puts the collar on, it adjusts to fit them and then disappears. The now invisible collar is attached to an imp which perches on the left shoulder of the person wearing the collar and whispers advice to them. The Imp can also cast burning hands (or another appropriate low level fire spell) once per day. The DM should feel free to have the imps advice be suspiciously good or just suspicious, but it seems eager to serve its new master. The imp knows that it is fated to be chained to the collar until the world is broken in two (or the DM can use another apocalypse more suited to their campaign). The collar and imp should remain invisible to all but the most potent of divinations, so a True Seeing spell should reveal the imp, but a mere See Invisibility should not.
In play, the imp makes an excellent proxy for when the DM wants to remind players of something they forgot or overlooked, or to otherwise spur the PCs to interesting, if slightly unwise or risky courses of action occasionally.