A matter of Life and Death

Wu is dead.
The ninja are split apart.
"We don't need them anyway. Our city is a peace."
That's what they all say.
But never have the citizens of Ninjago been more wrong.
A dark evil is arising, and it's hungry for power.
And for revenge.
But it's too strong for just the ninja to defeat, but not all hope is lost; there are three lost elemental masters, their last hope in saving Ninjago.

That's what they thought.