A hatchet that acts as a vessel for a moderately powerful ghost that generates frost when used. Since the inhabiting ghost can respond to the user's request, it can be considered a halfway point between a Familiar and Implement. Without actually being either of those.
Without any inscriptions on the hatchet, the ghost could have left any time she wanted. She was also likely to use all her energy in the first attack, creating a destructive freeze-blast large enough to kill the wielder. Thankfully the Lawyers did the inscriptions for free.  In addition to the frost attacks, the hatchet also hits with a hopelessness aura.
It was destroyed, and June released, near the end of the contest against Conquest.
↑“Well, this works as a kind of stopgap measure as a half-implement and half-familiar,” Rose said. “Not sure how you’re going to conceal that hatchet all the time, but it works.” - Excerpt from Damages 2.3
↑You can blend as a more permanent thing (not what Laird does). You can have a familiar plus demesnes for a more intelligent demesnes. A familiar plus implement for an object with a personality. An implement plus demesnes for a demesnes you could bring with you. Generally you take a pretty significant hit to power in exchange for some degree of utility. You also lose standing with practitioners and Others. I think I've posted on this before. If you have a talking motorcycle you're giving up 90% of the power of a proper implement and 90% of the power of a proper demesnes, but you're getting an implement that's more weighty and a comfortable seat that isn't limited to one place. And because you're a practitioner that's flouting convention then convention helps you less, so your practice in general isn't going to be all that. - Reddit comment by Wildbow
↑“We’ll need a way to inscribe the handle, or she can leave any time she feels like it, and she’s liable to go out in one big intense shot of cold the moment you hit something,” Rose said, as I made my way into the hallway.
↑She handed me the hatchet, handle first. “I explained a great deal. Surely one of you two can pull something out of it.”
The pattern of the silver wire continued on with the pattern scratched into the metal. Faint, but noticeable where the light caught the rough patches versus the smooth patches. The silver wire in the grip didn’t dig into my hand. - Excerpt from Damages 2.5