Your footsteps creak as you go into your workshop like every other day. The lights flicker before they turn on. The first thing you notice is an unusually shaped handprinted seemingly indented into the wall. It seems humanoid, but the fingers seem.. too long. You then realize all the metal seems to have disappeared from the workshop. For the most part, all that remains are the handles of the items that were useful tools. Even the metal hooks that held up your metal balancing ruler are gone, and all that remains of the ruler itself are the tubes that held the liquid and the bracing. The wrenches are gone too, all that remains are the indents were they originally rested. You hear a strange artificial humming – like a machine – coming from just outside the wall to your left. You shudder and wonder if you just missed the… creature that took your metal. Dousing the lights to avoid attracting unnecessary attention, you grasp the metal talisman at your neck, grateful that it is still in your possession.
Your mystery is really interesting, in the fact that all the metal is gone, yet the tools remain otherwise undisturbed. I also like how it remains ambiguous as to who or what commited this crime.