Sorry this took so long! I got sick during the week ._.
Cas was still interpreting what had happened. Never in his existence had he thought Dean was one to give up.
In that moment, a sudden wave of nausea washed over him. His energy seemed to be draining from his body. A dull ache began to grow within his core. He felt to his knees, groaning in agony.
"Cas? What's wrong?" Sam asked in concern.
"My grace, it's burning out," the angel gasped.
"What do we do?"
"Nothing. It's going to burn out and s-so am I."
"I just lost Dean. I am not losing you too," Sam said, "Metatron said you need to recharge your 'batteries' right? We just need to get you another grace."
"No," Cas protested, "I don't have the right to steal another angel's grace."
"Dammit Metatron! This is all his fault. I should've killed him the moment I laid eyes on him!" Sam yelled in frustration, "Wait, that's it. You can take Metatron's grace. He took away yours for that stupid spell so it's only fair if you take his."
"I-I suppose."
"Come on Cas, it's better for everyone if he's left powerless. You're doing the world a favour. Just let me help you."
"Fine. D-drive me to the Gate. I'll tell you the directions," Cas said, "I'll deal with the matter from there."
Sam helped him out of Cain's house. The Impala was still parked outside. He placed Cas in the backseat and drove as fast as he could.
With difficulty, Castiel drew the sigil on the ground and opened the Gate of Heaven and staggered in alone.
"Castiel?" Hannah asked, "I didn't expect you come back so soon."
"Br-bring me to Metatron."
"What's going on? What does Metatron have anything to do with this."
'Just bring me to him!" Cas half-shouted with the little energy he had left.
He entered the Jail of Heaven, in the middle cell sat the one who brought destruction to all of them.
"Hello Castiel. Back so soon? Are you here for revenge about Dean Winchester?"
"Sh-shut up."
"What's wrong?" Metatron smirked, "Running out of batteries already?"
"I said shut up," Cas slid his angel blade out of his sleeve.
"No need to get aggressive. I thought we were just having a friendly conversation."
Cas lifted his blade higher.
"Planning to kill me?" Metatron snickered and walked towards the dying angel, "I doubt you even have the juice to do it."
Castiel had enough of the villain's taunting. He slashed at Metatron's neck with all his might.
Metatron's eyes went wide as his grace began to seep from the wound. Cas opened his mouth and swallowed the energy.
He felt a surge of power rushed through his veins. The grogginess and aching was gone. He sighed in relief.
"You can't do this," Metatron yelled, "Give it back, give it back now!"
Cas smiled coldly and replied, "Goodbye brother."
The angel and the hunter attempted to track Dean, but it was almost as if he had disappeared of the face of the earth.
Cas ordered a troop of angels to keep a look out for the demon since their own searching was lacking efficiency.
After a month of silence, they received news about demon activity concerning the people the brothers had once saved.
"So get this," Sam said, "The people Dean and I met or saved are mysteriously disappearing. Police reports stated the victim's houses reeked of rotten eggs."
"What if it's Crowley again?"
"There's no reason for him to continue a killing spree he started years ago. And plus, he used witchcraft. These evidences prove to be the work of a demon."
"But why?" Cas asked, he wouldn't believe the man he once knew would murder innocent people.
"He's been gone for over a month. Probably in Hell," Sam sighed, "Who knows what happened to him. I'm not even sure if he still has his humanity."
Cas knew this was a hard for him, accepting the fact that his brother was no longer human.
"We got a lead," Sam continued, "The last victim was detective Diana Ballard."
"Who?"
"We met her before we met you. We worked on a case in Baltimore about some spirit and 'Dana Shulps'."
"So who's next?"
"Evan Hudson," Sam said, "We saved him from hellhound. He lives in Greenwood, Mississippi."
Cas stood up and said, "What are you waiting for then. Let's go."
Crowley greeted the two once they've arrived at Evan Hudson's house.
"I told you it was him," Cas whispered to Sam.
"I'm sorry darling, but it's not me today," replied the King of Hell, overhearing his comment, "But your friend is really enjoying himself in there."
Sam's expression turned blank and rushed into the house with Castiel close on his heel.
Blood seemed to be everywhere. On the floor, on the wall, on the furniture. Dean stood over what was left of Evan Hudson in the centre of the living room.
He was laughing. The sound sent a chill down the angel's spine. The sight will be forever etched in his mind, haunting him when he closed his eyes.
"Dean?" Sam said in a hushed voice.
The demon spun around, "What are you doing here? I told you to leave me alone."
"But Dea-"
"Why can't you just leave me alone?" Dean eyes turned wrought iron black as Sam was flung across the room.
"Dean," Cas said, "Stop this right now. We want to help. Please just let us help."
"I don't want your help," Dean said coldly and disappeared once again.
Cas hurried to Sam's side, checking if he was injured.
"I'm okay, I'm fine," Sam groaned while rubbing his head.
"Are you sure? Do you want me to heal you?"
"Don't you dare use your angel mojo on me. If you run out of juice again, I don't know how to get you a refill."
Cas didn't really understand what juice had anything to do with this but still nodded in agreement.
He helped the taller man out of the house and into the impala. He looked for a first-aid kit and patched up any scarps and cuts Sam had.
Once Sam had ensured him that he was capable of driving, they returned back to the bunker.
The hunter stormed off to his room without a word. Cas didn't stop him, knowing he needed time to cool off.
He himself also needed to comprehend the situation.
Castiel knew the righteous man he saved all those years ago was gone. In his place was a heartless monster.
The Dean Winchester he once knew was no more.
Tell me what you think :)
