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The Ukkoskivi (listen Audio.svg) (also known as Thunderstone) is a common inventory item.

It has a 2.2% chance to spawn in Item Pedestals, a 7.7% chance to spawn in Pedestals in the Ancient Laboratory, and a 0.75% chance to spawn from Chests


The Ukkoskivi sends out electric shocks at regular intervals, along with granting immunity to Electricity while held in hand, effectively rendering itself harmless to the holder. The shocks quickly pass through any conductive materials it's directly in contact with, such as Water or Steel, stunning and damaging any vulnerable creature they reach.

Thunder Mages and their greater variety won't attack you while you're holding the Ukkoskivi.

SPOILER: An Ukkoskivi can also be reliably obtained by picking up the Essence of Air and then removing it through the Essence Eater.


  • Unequipping or throwing the Ukkoskivi removes its electric immunity immediately. Take care before leaving conductive pools and platforms.
  • If thrown into a body of conducting liquid, the Ukkoskivi can be quite difficult to retrieve safely.
  • The periodic electric shock will detonate nearby traps and volatile items, should they come in contact with the shocks or are made out of conductive materials themselves.
  • The Ukkoskivi can appear when opening a Treasure Chest, including one that is submerged. Opening a submerged chest might instantly kill you, so opening it from afar or moving it out of the water beforehand may be advised.


Ukkoskivi will electrify any conductive materials, such as Copper or Water.
While holding the Ukkoskivi, Ukko and Suur Ukko will become passive.


  • Mar 30 2021: Explosions won't destroy Ukkoskivi as easily.
  • Apr 30 2020: Unequipping Ukkoskivi while submerged is now safer.