Vengestone

Vengestone is a mysterious substance that can disable Elemental Powers, making an effective containment measure against Elemental Masters.

All of Nothing
When the Serpentine trapped Master Wu, the Ninja, and Nya inside a cage made of Vengestone, Kai suggested they escape using their elemental powers, but Wu informed him that it's no use, since the rock wards off their elemental powers.

Spellbound
After loading up the defeated Elemental Masters (except Lloyd), Chen threw them in a cage made of Vengestone to prevent their escape.

The Forgotten Element
Brought before Chen, each Elemental Masters were place in chains made of Vengestone as Chen used his Staff of Elements to steal their powers. Later on, after easily defeating Lloyd, Chen had the Green Ninja placed in Vengestone chains before stealing his elemental power.

Very soon, Kai stole Chen's staff and destroyed the chains binding Lloyd with the powers of the Staff.

The Day of the Dragon
Kapau and Chope use a net made of Vengestone to trap Kai and Skylor.

Stiix and Stones
Ronin attempted to trap the Ninja in a net made of Vengestone but fails.


 * The following events were erased due to Jay's final wish and thus did not happen in the current timeline.

Public Enemy Number One
While pursuing Jay on the roller coaster, Ronin attempted to capture him by using a Vengestone net, but missed.

Enkrypted
After Lloyd tries to break the handcuffs, Noble mentions that they are made of Vengestone and can also stop Cole's ghost abilities.

My Dinner With Nadakhan
In order to prevent Jay from escaping, the Sky Pirates use a ball and chain made of Vengestone.

Wishmasters
Cole used his first wish from Nadakhan to make Vengestone strengthen their powers instead of canceling them. To everyone's surprise, it worked. But eventually, the Vengestone restraints caused their powers to grow too much and become uncontrollable. This forced Lloyd to make his own loophole to counter Nadakhan's by breaking their chains, freeing them as well.

The Way Back
As a result of Jay's final wish erasing the events of the season, Nadakhan would never grant Cole's wish, thus making Vengestone retain its original effects on the Ninja and the Elemental Masters.