Ettmetal is the Godmetal of Harmony from Mistborn Era 2, it explodes upon contact with liquids so trying to use it for Allomancy or Hemalurgy is pointless at best.
However it has a unique property: when someone nearby uses one of the Metallic Arts, a Ettmetal can copy it and use it.
For if a Pulser Burns cadmium and channels it into Ettmetal the metal will create it's own Slow-Bubble, making cadmium have a use in combat.
I'm wondering if it can use any other abilities like Surgebinding?