[The item in question isn't useful in the sense that it could be used to heal someone but it would certainly be useful when a certain flatmate is bored out of his mind and driving the rest of them crazy.

He almost snorts at the 'emotional familiarity' part but stops himself. Sherlock claims to not have emotions or attachments so this will be fun.]

I'll give it a go and see if it works. Last world I was in provided us with coupons that we could trade for items so I wondered if it was something I could try to get myself.