Ukkoskivi
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The Ukkoskivi (listen ) (also known as Thunderstone) is an inventory item. While held in your hand, Ukkoskivi produces a periodic electric shock and provides electrical immunity. The electric current rapidly passes through conductive materials such as water or steel, and will stun and damage any non-immune creature it touches.
Thunder Mages become peaceful to any holder of Ukkoskivi.
Tips
- Unequipping or throwing Ukkoskivi cancels its electrical immunity immediately.
- Take care before leaving conductive pools and materials.
- If thrown into a body of conducting liquid, Ukkoskivi can be quite difficult to retrieve safely.
- The periodic electric shock will detonate nearby traps and volatile items.
- Ukkoskivi can appear when opening a Treasure Chest, including one that is submerged. Opening a submerged chest might instantly kill you, activating them from afar or draining the water may be advised.
Other methods of obtaining

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An Ukkoskivi can be reliably obtained by picking up the Essence of Air and then removing it via the Essence Eater.