AN: This is my second fanfic. I know I haven't finished my 1st one yet but this one has been stuck in my head for ages. I promise to update more as I have just finished my GCSEs and have nothing to do for the minute. crosses fingers, hoping not to jinx it Read and Review!

AN 2: Ok this is 2010 and I don't want to think how long it has been since I last updated this story. I could give you many reasons and excuses why it has been so long but none will be good enough. So all I can say is I'm sorry. :( But my plan is and so far has been to re-edit and continue this story. Sorry if it confuses any previous readers. I just hope that my muse does not disappear again. :) Much love and read and review! :D

Disclaimer: I do not own Sailor Moon or Harry Potter. I only own the plot line for this story.

Timeline: It starts at my own version of the battle at the Department of Mysteries. It is many years after Serena turns into Cosmos.

Summary: AU During the fight at the Department of Mysteries the Order and the Trio meet Luna's Guardian Angel. She disappears soon after bringing up a lot of questions for the next year along with two new teachers.

Lady of the Stars

Chapter 1:

Harry couldn't help but blame himself for believing the vision Voldemort had sent him about his godfather and relief was felt when members of the Order of Phoenix along with other aurors came to aid them. Although Harry, Hermione, Ron, Neville, Ginny and Luna were pretty good fighters they would have been totally outnumbered by the twenty odd Death Eaters and Voldemort himself. Those who came to help certainly made the odds of surviving better.

Everyone was locked in a fierce battle. Curses were being yelled and cries and screams of pain could be heard, the sounds in the were room deafening. Dumbeldore was holding off Voldemort as other Death Eaters tried to get to Harry, who were being stopped in their path by Hermione, Ron, Ginny, Neville, Luna and the Order. At the moment none of the non-members paid attention to the fact that the convicted murderer was there, they were too preoccupied in capturing the Death Eaters.

However since everyone was in their own battle, trying to protect the Boy-Who-Lived, they didn't notice the only child of the Lovegood's being separated from the main members of the Order. She was soon cornered by a short and plump Death Eater with her wand out of her reach. She watched with eyes wide and full of fear as the man lifted his wand shakily and stuttered out the words of an Unforgivable. "C-Crucio" the man said squeakily.

Luna screamed in agony as pain shot throughout her body and she fell to the ground on all fours. The man flinched from the sound and got ready to end the girl's life. He did not see Luna reach a quivering hand into the top of her shirt and bring out the pendant attached to a necklace around her neck.

It was an exquisite and unique piece of jewellery. The pendant was of a silver angel with her wings outstretched behind her and she was holding a gold eight-point star to her chest. The angel was held on a delicate silver chain, it's delicacy and quality hinted at a high price even though it held no gems or crystals.

Luna clasped her hand around the necklace and time seemed to slow as the memory of her receiving the necklace flashed in her mind.

Flashback:

In a baby blue bedroom there was a nine year old version of Luna sat on her white carpet, looking at the woman who was across from her with admiration in her eyes, as she listened to another recount of one of her adventures. The woman was sitting crossed-legged on the floor in loose fitting black trousers, a tight long-sleeved blue shirt which seemed to bring out the specks of blue in her wise silver eyes. Her long, luminescent silver hair pooled around her held up in two heart-shaped balls on either side of her head. As the woman finished telling her tale, Luna could only utter "Wow" in awe.

The woman chuckled softly as Luna sat there staring at her. "I have a present for you."

A look of surprise appeared on the younger girl's face, which was soon replaced with happiness. She bounced on the spot. "Really, what is it, can I have it?"

The lady reached inside a silver bag she had brought and took out the necklace. She showed it to Luna who stared at it, amazed someone would give her something so beautiful and special looking.

"This necklace is no ordinary necklace. It will allow you to contact me when you need me the most." The woman said as she proceeded to place the necklace around the little girl's neck. "Just hold the pendant and call for me and I will come to you as fast as I can." Luna listened intently to what she said. The lady then spoke with complete seriousness. "But do not use it to call me for small things, only when you need me the most, okay? Because I might be doing something really important." The lady looked lovingly at Luna and smiled as she nodded with as much seriousness a nine-year-old has.

End Flashback.

Luna closed her blue eyes, held tightly onto the pendant and wished with all her heart. "Please Sere, I really need you. Please help me!"

The Death Eater raised his wand again and spoke the words which would end Luna's life: "A-Avada K-Kedavra." Expecting to see Luna scream and fall to the ground dead, but that was not what he got.

There was flash of silver and then a large explosion. Dust and debris flew in all directions and the sound stopped some activity around them as people stared in confusion at where the explosion came from not expecting such a large outburst. Curiosity grew as the smoke and dust cleared to reveal two figures crouched on the floor and the Death Eater slumped against the wall staring with eyes full of fear.

Quiet reigned as the few spectators watched the silver cloaked figure uncover the other and slowly stand up, having protected the smaller one with their body. Luna was soon recognised staring up at the other figure with amazement and relief. "Thank you. I didn't know if you would come." Luna spoke, her voice still shaky from her near death experience.

"I gave my word that I would come when you called me. I do not go back on my word, you know that Luna." The cloaked figure replied with the reassuring tone of a young woman. The spectators watched as she turned around and slowly walked towards the Death Eater who had cursed Luna, her cloak swirling about her legs. The man's body shook more with every step she took towards him; his eyes wide with growing panic.

When she spoke again it was not with the soft and reassuring tone she talked to Luna in. Instead she spoke to the quivering mass in a cold threatening tone. "How dare you harm someone under my protection! For it you shall suffer!" Glancing round at the scene around her she halted her words. "But first…" she outstretched her bare arm with her slender palm, of a bejewelled hand, facing up. She murmured something that only Luna and the man could hear with only one understanding. "Venus Love Chain," a glowing gold chain with hearts as links appeared in her hand. "Encircle." The chain shot out of her hand and wrapped itself around the Death Eater pinning him to the wall. "…stay there, until I decide how to punish you." She finished.

Before any of the audience could wonder over this new development, everyone's attention soon turned to a stone arch cloaked in darkness, as the anguished yell of Harry Potter was heard as he watched Sirius Black fall through. Only thing stopping him following being the firm grip of a horrified Remus Lupin.

Voldemort cackled in glee at this turn of events and threw one last curse at Dumbledore, who deflected it, before disapparating. The Death Eaters who were not either unconscious or bound soon followed. Leaving only members of the Order, six Hogwarts students, the mystery woman and other Ministry aurors.