Sometimes it was hard, being the only child of Thanatos in a century.
She did have friends, but they were never around, probably off saving the world from another deity that wants to wipe out human life. So, to compensate for her lack of social life, Cassandra trained, and fought, and became so skilled with a scythe, campers whispered to each other saying she could rival Percy Jackson.
When her friend did return from being on the Argos 2, Cassandra did try her newly improved skills against him.
Turns out, Percy still could kick her ass, even if he had to try a little bit harder that time. Annabeth laughed herself into tears when she saw her boyfriend struggle against their friend, "You're losing your touch Seaweed Brain," she would joke, and then the trio would laugh themselves silly, fond memories of the summer after the Titan War floating to the front of their minds.
But then the pair eventually left camp, Annabeth had to help her cousin with some Norse shenanigans and Percy had to study for SAT's.
And Cassandra was alone.
As it turns out, being the daughter of Death makes some people feel uneasy around you. Having the sharp personality of a knife probably didn't help either.
'It's not fair,' Cassandra thought to herself, 'my sense of humor is not that morbid, or sarcastic. Percy thought I was hilarious, Annabeth too.'
When Nico di Angelo started to stay at camp, Cassandra hoped that maybe, as children of the Underworld, she would be able to make a new friend, as well as learn more about her powers.
And for a while, she wasn't lonely anymore.
Cassandra grew leaps and bounds in her powers. Nico taught her to embrace the darkness, "You control it," he instructed, "it doesn't control you." The two of them experimented, tested the boundaries of their powers, and pushed beyond them.
That is, until Will Solace forbade Nico to use Underworld magic on a regular basis, if at all. Without the constant practice and the immunity built up to the after effects, Nico's health quickly deteriorated, and he began to lean on Will for support.
She was happy that Nico began to feel comfortable with his sexuality, and even found love with the blonde doctor, but Cassandra couldn't help feel bitter towards the doctor, she didn't see him fussing over her health, so she suspected there were feelings involved in the "doctor's orders" ordeal.
Nico still tried to make time for her, which she was extremely grateful for, but it wasn't the same. How could it be, when they couldn't summon a skeletons to fight each other, or play games seeing who can shadow-travel the fastest to a certain location?
Cassandra sighed as she stared at her reflection in the water, her unusual gold eyes she inherited from her father staring back at her. Nico sat silently as well, his eyes watching the shadows grow and shrink, all according to her will, "I don't see you around anymore," he stated quietly, watching her tense, "are you avoiding me?"
She turned and faced him, "Of course not," she said simply, "I'm just in my cabin, contemplating my existence, or training, taking my anger out on others," another sigh, "I'm starting to feel restless Neeks, being cooped up inside the safety of camp when there's a whole world to see, to explore."
Nico studied the teenager in front of him. She really was the spitting image of her father, long raven curls, teakwood skin, and aristocratic features. Her striking gold eyes reminded him of Hazel, her tall, lean, muscular build could rival Reyna's. The way she cared and made sure he never over exerted himself painfully reminded him of Bianca. Cassandra Callaghan became another sister to him, and he realized that, like all his sisters, wanted to spread her wings and explore what life had to offer, even if it meant leaving him.
"Where would you want to go?" He asked quietly, "if you could go anywhere, no monsters on your tail, or meddlesome gods," a loud clap of thunder which they both ignored, "just you and maybe some friends, where would it be?"
Cassandra felt herself smile despite her solemn mood, "I've always wanted to go to Mystic Falls or New Orleans. The history behind those two places are fascinating, witches, vampires, and werewolves? A whole new category of monsters we've never seen before."
Realization dawned upon him, "You want to meet the Originals, don't you."
A smirk made its way to her face, "Guilty, but don't tell me you've never wanted to meet them too? Father told me they're the closest thing to immortality, and I want to see it for myself."
"I think the fact that they'll probably kill us the moment they smell our blood puts a little damper on the so called excitement of meeting them," Nico added dryly.
Cassandra snorted, "They've lived for a thousand years, surely they have some self-control. I mean, they were human once, right? The 'kill first, ask questions later,' seems a bit far fetched to me."
He suddenly became really quiet, "Do you really want to leave?" The me hung unsaid between them.
Cassandra was quiet for a moment, "I can't stay here forever," she said finally, "and you have a life here, friends," a pointed look, "a boyfriend." At Nico's blush she continued, "truthfully, I think I'm a wandering spirit, I want to see the world, and I can't stay here," she hugged him, feeling him stiffen at her touch, so she quickly released him, "you can visit," she offered, "and I'll definitely IM you daily."
He eyed her, "You already decided to leave, didn't you."
"I asked Chiron yesterday, we arranged everything. Argus is taking me to Mystic Falls tomorrow. I-I just wanted to say goodbye first," she averted her gaze back to the water.
Nico hugging her surprised the both of them, "Don't die," he said softly, "I'll bother you in the Underworld if you do. And I'll visit, I promise."
Cassandra told herself before this conversation that she wouldn't cry, but she couldn't help the tear that trickled down her cheek, "I'm going to miss you Neeks," she said honestly, "you're a brother that I've never had, and I really really hope you visit. We can interrogate the Originals together."
"Kick their asses for cheating death at least once for me Cassie," with one last hug, Nico left, once more leaving Cassandra to her thoughts.
And for once, she doubted that she was alone.
She stood up, taking one last look at her home for the past 5 years, looking at the campers walking around and laughing to each other, and Cassandra felt herself smile.
It's true, she would miss this place.
But adventure awaited her elsewhere.
And she was going to find it.