Sorry it took so long. I've been very busy, but here you go!
"So turns out, "Ania" was part of a trio in Greek Mythology."-
"There's more than one of her? This should be fun."
Sam and Dean arrived back in their motel room after a pit stop at the local authorities, who informed them that they didn't know anyone by the name of Ania. And the hospital, who informed them that several people had come in with symptoms that didn't add up to any particular disease, and the patients wouldn't respond to any treatment given. They all died within twenty four hours of arriving. Castiel had disappeared during the car journey home and neither Sam nor Dean had heard from him.
"The Algea is the name given to the three spirits together. Apparently, they were spirits of pain, grief, and if we can think back on our conversation with Ania"-
"Trouble."
"Bingo. The other two, Lupe and Achus, are the spirits of grief and pain. And, check this out." Sam handed his laptop across the table to his brother "Look at the info on their family."
'Parents: Eris (goddess of strife and discord). No father.'
Dean handed the laptop back to his brother. He would probably regret reminding the Greek spirit of trouble that she had no father a little more if she wasn't such a bitch.
xXx
Castiel arrived back at Ania's house, now empty as the people trapped in the living room had fled the premises. Upon arriving, he felt weak and dizzy, and tripped on the stairs leading up to the house. The front door was open, so the angel allowed himself in.
"I half expected you to knock." The spirit said from behind him once he was in the hallway.
"The door was open"-
"Yeah, well my mouth opens when I speak but that's not an invitation for you to kiss it." Castiel followed Ania into the living room, and the spirit looked back over her shoulder when he stopped suddenly and gasped. An extremely sharp pain shot through the unsuspecting angel's chest, and he grasped the door frame to support himself.
"Can I help you with something?" Ania mocked, smiling at the expression on his face.
"What have you done?"
"I trapped a bunch of people in my house so that my brothers could torture them"-
-"That is not what I mean." Castiel snapped, walking towards Ania.
"I know what you mean, Cas. That's a cute nickname by the way, do you actually let him call you that?"
"Why are you doing this?"
"I'm not doing anything to you, it's my family you want to worry about."
"The Algea were destroyed a long time ago"
Castiel took another few steps towards Ania, but his knees then gave way and he fell to the ground, the sharp pain returning to his chest. He winced and made an audible grunt of pain, trying to stand up. Ania knelt down in front of him and lifted his chin so that he was looking at her.
"I don't like you, in case you hadn't guessed. It's going to take some convincing to make me think otherwise. Even then you shouldn't be so sure that this is going to stop."
Ania stood back up and Castiel's head fell to the floor, too weak to look up at the spirit of trouble, that despised him enough to put him in this state and enjoy it. He felt ashamed and useless, lying on the floor, breathing shallowly, forcing himself up and away from Ania.
"You can bite down and take the pain until your boyfriend and his sidekick find a way to 'destroy' my brothers and I, which no doubt they will. Eventually. Or you can wait for the Keres to come and finish our job. We're all coming back Castiel, one at a time and there's not a whole lot you can do about it."
"You have opposite numbers. They will s-surely destroy you if we don't."
"The Kharites have nothing on us! They will take centuries to emerge, and when they do, you're likely to be dead anyway."
After a few brief moments that felt pain-free to Castiel, the pain returned again in the form of a burning in his stomach. He tried to avoid Ania seeing him like that, but it was sudden and unexpected, and the angel was looking her straight in the eye when his face crumpled into an expression of extreme discomfort and he let out a low wince of pain.
"Have fun kiddo." Ania said with a mischievous smile, before Castiel gathered up the strength to transport himself back to where Sam and Dean were staying.
xXx
"Dean, I don't know how we're supposed to stop this many mythological creatures from coming back. I mean, most of them are gods and goddesses. Then we're talking dragons, giants, the whole history of Greek mythology here."
Dean got up from the bed and ambled over to where Sam was sitting with his laptop. "Well, aren't you the optimist?"
"I mean, they all have their counterparts. Other spirits that could easily destroy them, but that could mean another war on earth that has nothing to do with us."
"Christ. Well, they're myths! Tell them to go find some other mythological planet to have their little argument on!"
"Believe me, if I knew how, I would."
At that moment, Castiel appeared. He had no visible injuries from what the boys could tell, but he was clearly finding it difficult to move anywhere with great speed. Dean and Sam exchanged looks and went over to help the angel.
"What, you waste your energy on flying Cas?" Dean asked, unbeknownst to his pain caused by the algea.
"It's Ania. Her and her brothers have decided that they are going to torture me. But I don't know why."
"Ever thought it might be cause you piss them off?"
"The algea… they were destroyed shortly after the angels came to power, and we locked them in a mythological universe. But they've… they've come back, and I think they want r-revenge!"
At that point, the angel lost all strength due to the pain, and would have collapsed had Sam and Dean not been there.
"Cas? Cas!" Dean tried to shake Castiel out of his state but it was no use. The angel was trembling with pain and gasping for breath.
"Alright. Put him in there, I'm gonna go see what this bitch wants."
"Dean, shouldn't we both go? I mean, you saw what she did with Cas. And you're not exactly easy going when you're angry."
"I'll be fine Sammy. Just stay here and watch Cas. Make sure he's okay, and make sure he doesn't die."
With that, Dean angrily grabbed his jacket and stormed out. Sam waited a few minutes until he heard the wheels screech onto the road, then proceeded to take Castiel to the bedroom to lay him down. The angel shuffled alongside Sam, but was mainly being pulled along, too tired to cry out in pain or move.
"Alright Cas, it's okay. You're gonna be okay, alright? Just call if you need anything."
As Sam went back to his research, and Dean sped towards Ania's house, Castiel lay helpless, drifting in and out of a painful sleep.