AN:

So I've done another cross over AU story. Yes I have two others going but I'll be updating each story as I get a new chapter done. This has underworld, Mass Effect, and I've taken the death shadow class battle ships from space pirate captain harlock (2013) mainly because I like the way the Arcadia looks before it was exposed to dark matter (this will not appear in this chapter but later chapters). As the author I've played around with the dates to make them fit the story and taken liberties to make the environment fit the story as well.

In the Underworld universe it is theorized that Vampires can mate with Humans so in this universe Shepard's Mother is none other than Selene. Her father is an unnamed human who Selene only knows his last name.

April 11th 2154
Unknown Location
Earth

Selene screamed in pain while giving birth to her second child. She thought of the father who she had met during a raid on a Lycan colony. He had died at the hands of a Lycan a few months after the raid before she knew she was with child. Another contraction and Selene was brought back from her memories.

Another vampire was present to help in the birth of her child. She may not have approved of a half human half vampire off spring, but Selene had saved the vampire race from being purged and being accepted into human society. "That's it Selene, your daughter is crowning one last push and it'll be over".

With one last push Selene felt her child pass into the world and then heard her cry. The midwife then handed the new born child to her mother and she had to admit that she was cute for a half breed.

Despite having drunk the blood of the first immortal and becoming a pure blood Selene had not forsaken her humanity that Michael had reacquainted her with. So when she first saw her daughter she was brought to tears. "Hello, Athena".

When morning came she was attacked by a single Lycan who had escaped the Lycan purge. It went for Selene and Athena but the midwife interfered with its plans. She fell to the Lycan only after injecting silver nitrate into it killing it. Selene had aided humanity in the Lycan purges and it made her and even bigger target then she was before. This also added the benefit of having a mixed human vampire protection detail which rushed into the room to find an irritated Selene comforting a crying Athena.

When first contact was made with the Turians vampires helped stop their troops in their tracks on Shanxi although Selene was not present herself others followed her example and fought bringing fear to the hearts of the aliens.

August 19th 2172
Attican Travese
Mindoir

Athena Shepard awoke when she heard the front door get kicked in. She had no idea who would be crazy enough or dumb enough to attack the house she shared with her mother. She had heard that slavers would attack colonies at random but had never heard of them attacking colonies with a high population of vampires. So she was beyond surprised when she saw a group of Batarians and Turians barge into her room. Before any of them could react to seeing her in her t-shirt and pajama bottoms she attacked ripping out the throat of one of the Batarians. .

"Shoot her she's not worth the trouble" the lead Batarian ordered. With that the group opened fire on Athena. They did not see Selene come charging through the door at the moment they started to shoot her daughter.

Selene had left the blood bank after making sure that everything had been secured and all the defenses had been activated. She ran as fast as her abilities would allow her towards her home and her eighteen year old daughter. Running in through her front door she saw a group of aliens shoot Athena repeatedly. She did not wait for the group to stop firing before starting to tear through them. She ripped arms from torsos and tore bodies in half from groin to neck. The very last member of the group she had delighted in slowly ripping their head from their shoulders and seeing the look of horror in their eyes.

Once she was finished she went to her daughters' side and saw that she was still alive but just barely. "Athena you need to drink my blood or you are going to die". When Athena tried to protest Selene thrust her wrist in front of her daughter and commanded "Just do it".

Athena knew that once she drank her mother's blood she would cease being half human and would become like her mother, a hybrid of the vampire-Corvinus strain. This strain had granted her mother the strength and abilities of the first true immortal. She tried to protest but her mother quickly shot them down and she finally relented. Letting her fangs grow she latched on to Selene's wrist and began to drink. Almost immediately she felt the effects of the blood running through her veins. Though it was different than normal blood (which she preferred over eating food) it still felt similar.

Selene watched as her daughter drank her blood only stopping her when she had drank enough to heal and become like her. She saw the anger in Athena's eyes at the fact she was forced to cast aside her human half. Her anger was not directed at her, but towards the slavers. Selene stood with her daughter and watched as her eyes turned from piercing steel blue to gold.

"I want to kill all of them, Mom". Athena growled out through clenched teeth.

"Then follow my lead and remember what I taught you Athena". With that being said the elder of the two vampires charged out of the house followed by her daughter whose thirst for revenge would only be sated by the death of every slaver in the colony.

By the time the Alliance had arrived at the colony the only thing left for them was a slaughter. Every slaver that had landed on the colony had been torn asunder. Limbs were scattered throughout the colony and the alliance soldiers even found some batarians who had been disemboweled by having their innards ripped through their stomachs or hearts removed through holes in their chests. When the Alliance finally found survivors they heard tells of a vampire slaughtering thousands while crying blood and screaming that they took her human half away.

Selene approached the alliance Marines and asked to see their commander. Every Marine present recognized who she was and didn't waste time pointing her towards a Lt. Anderson. "Lieutenant Anderson may I have a word with you?"

Upon hearing his name Anderson turned and was surprised to see the undisputed queen of all vampire kind. "Selene what are you doing here. How is Athena doing?"

"That's what I'm here to discuss Anderson". She stopped and looked around before continuing, "I know what caused this slaughter but prefer not to discuss it in front of everyone."

Anderson stood looking at her for a few seconds before telling everyone to clear out. "Ok Selene, what happened?"

"My daughter, that's what happened Anderson".

Anderson was shocked and silent for a minute before he found his voice again. "What do you mean your daughter happened?"

"It's better if I just show you. But I suggest getting on the horn and contacting Admiral Hackett and setting up a meeting as soon as possible".

Arcturus station
August 21st 2172

"Admiral Hackett, an N7 that was on the ground at Mindior is requesting a meeting with you. He has two females with him".

Hackett stood looking through a window overlooking a dry dock which was currently working on a new class of vessel. Upon hearing the message he closed his eyes and sighed, "Very well send them in and do not let anyone interrupt us".

Lt. Anderson walked in followed by Selene and Athena. Anderson was not looking forward to this meeting. "Admiral Hackett thank you for seeing us on such short notice".

"This had better be related to Mindior Anderson". Hackett then turned around and saw Selene with a girl he assumed was her daughter. "Selene, I'm guessing you had something to do with what happened on Mindior?"

"In a way, yes, Admiral that is why I am here". Selene then placed a reassuring hand on Athena's shoulder. "This is my daughter Athena and she is the main reason for the carnage on Mindior".

Hackett raised an eyebrow, "What do you mean she is the main reason for what happened on Mindior?"

"I mean she was technically killed by slavers and I had to make her drink my blood. This caused her to become like me and the loose the only thing of her fathers that she had". Selene noticed Athena tense at the mention of what she lost.

"Can you explain further Selene?" Anderson spoke up for the first time during the discussion.

"Athena's father was human and she never got to meet him due to a Lycan. Having to take my blood she became like me, a hybrid of the Vampire-Corvinus strain. Understandably she was upset and in her anger she caused most of the pirate's deaths in our town".

"I see, I honestly believe that the Citadel Council will shit bricks if this gets out". Hackett then stopped talking and thought for a few moments. "Athena would you like to join the Alliance navy? You wouldn't be the only vampire aboard our ships. Plus the Batarians would have a harder time getting to you not that they would right now it seems".

"Let me think about it Sir, I'm still getting used to things" Athena responded.