Elemental Forges

The Elemental Forges are powerful objects in the world of Ninjago

Shadow of Ronin
At some point, Ronin managed to uptain the Lightning Forge, and used it to attack the ninjas and Nya (after they had destroyed the new power source of the Nindroids) and thus forced them to flee.

The ninjas later, separated to uptain the Ice and Fire Forges. Meanwhile however, Ronin got his hands on the Earth Forge, and then attacked the ninjas again to collect the two remaining forges. After he had collected all of them, he then began to search for the Primal Fulcrum, to complete his plans.

Under Construction

Powers
The Elemental Forges are very powerful and also very dangerous objects, Whoever holds one of the Forges can then manipulate its elements, in a maner similar to an elemental master. The user can also use their power to construct a large elemental form to use in combat.