It goes KABOOM!

CRACKLE! CRACKLE! Jack moved his fingers, feeling a sharp pain above his elbows. "It hurt to move."

"Of course, it does. The connection to your nerves is still fresh," Cain smiled, handing Jack a small potion. "It needs to heal slowly, so take this to quell the pain."

The potion wasn't in a fat bottle like they use to. This one was in a cylindrical glass tube with steel needles at the tip. About five of them.

Jack looked at the potion, "Do I drink? How do I open it."

Cain took the potion from Jack's hand, "You don't drink it. You inject it like this." He pushed it into Jack's arm, and the pain started fading.

"How did you make these?" Jack looked at his new forearm, stunned. "How do they move?"

"Will take a lot to explain. Let's say they are enchanted to work." Cain smiled, helping Jack to stand.

"Try to walk slowly. Those limbs should be adjusted on their own." Cain looked at Jack's right leg as it changed in length, fitting his height.