Would the Cure Work on Cade?

Long story short, the cure is in Elena's blood. They could use it on Cade, and then Enzo could steal it from Cade, thereby aging him 4,000 years and killing him.

Does the cure work on Cade?

Caroline and Damon scheme to give the cure to Cade so that they can kill him and Bonnie reluctantly agrees to draw Elena's blood and give them the dosage instead of Enzo. Cade later reveals that his mission for Stefan was also to kill a hundred people or Elena.

Does Cade turned mortal?

As Bonnie has the same psychic power as Cade, she says she will fight for Damon. Bonnie is losing and Stefan plunges the bone dagger into Cade's chest, destroying Cade, making him explode and ashes fall to the ground.