It's a protective charm. Against ill intent.

( raising the needle up with the bar inside of it, to tape on the side. the gold glows soft as he touches it. )

And a panic button. If you're afraid, like, genuinely afraid, I'll feel it. I'll know where you are.

( a just in case charm, because oliver doesn't want to leave theo unguarded. him knowing might be a little useless, because oliver can't teleport but he could at least call someone else and tell them where he is. )

Lay down.