It’s BEST if you read my long-winded description… unless you want Lumi to CRUSH you with her enormous flank. No, really… she will do such.
 
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Meet Luminescence.
 
Vain, Arrogant, Extremely powerful, and very much full of herself… when she isn’t talking about herself in your presence… as she plans to step on you, or your entire city - all because you insulted her when she was just trying to INTRODUCE herself… with her flagrant and flamboyant ways. (I know… ironic, huh?)
 
She is a powerful Earth Pony, fueled by Dark Magic - distributed by a fully drained (and worthless) Orchid that is across her mane. (Well, worthless to anyone that wants to steal it that is - her body has drained every last bit of power there is to offer.)
 
While her sizes vary, she is RARELY ever a normal sized pony (if at all). She is not one to oversee anything there is to brag about herself; like her Sky Blue coat that she grooms appropriately every day, her green eyes (that were changed from their original Blue color - due to the Orchid’s dark magic), or even her mane and tail - above other things that she’d brag about.
 
 
Now, in the case that you wish to know about what her abilities are, hers likes/dislikes, and her background story… here they are. XD
 
Appearance:  
Luminescence is a pony with a Sky Blue coat, White Mane, and Sky Blue Highlights. The same goes for her tail. She has Seafoam Green Eyes (when not glowing), but bright Green when the dark magic within her is in use. She has an Orchid Blossom on her mane, of which the source of her magic (although vastly drained) rests on her head.  
Her Cutie Mark is that of a Growing Pony, stomping on the Earth itself
 
 
Stats and Abilities:
 
Luminescence is capable of using her vast power to do many great things. She can alter any landscape by stomping her hooves down, levitate ponies with her powers, grow to impossible sizes (and beyond), become an army of herself, and even use abilities that a powerful Alicorn can use. However, her abilities do have restrictions – she cannot change the skies or the weather, nor can she change the mindsets of other ponies through mind control. (In other words, her abilities are PHYSICAL in nature - not mental.)  
One of her most favorite abilities to use, is the ability to enlarge others, and influence them with her power – by doing so, her Dark Magic power grows.
 
 
Bio:
 
In her past, Luminescence was an ambitious trader and archeologist that wanted the thrill of a good chase. As a filly, a young Luminescence would be seen exploring caves, swamps, bogs, and even abandoned locales for the chase of obtaining any “treasure.” In doing so, she would get frequently injured, and overtime – her friends as well. Time passed, and she would lose her friends due to the many dangers that somepony like her would bring to them.  
Her parents, when she was growing up, had witnessed her many injuries – and the bills were piling up. This would culminate one day, as they would no longer allow her to do what she had enjoyed doing most: Exploration. She would run away from home, carry on to a new life – however difficult she would have it in the first place. Working odd jobs, she would send letters to her family, letting her know that she was doing fine – even if she had ran away from home.
 
One day, her luck would soon change – as she found a pony as passionate to her, as it came to her love of exploration – an Author by the name: A.K. Yearling. However, she would eventually know her as “Daring Do.” Daring, not one to trust many ponies would brush off young Luminescence. This would upset, but embolden the young mare further. That was until she was caught by the eye of one “Tosser, the Ruthless”, a Vulture Archeologist that was ambitious, and was a foil to the bold Daring Do. Hiring Luminescence, and guiding her under his wing – Luminescence would be a foil to Daring, in being a archeologist and a thief.  
As she was walking through the bizarres of a small town in Saddle Arabia, a crooked merchant would speak of a “Flower Field” that would grant her the greatest of wishes – for a price: Her Soul. INTERESTED in this soon-to-be-treasure, the young archeologist would extract the information to the location of such a field of flowers. 4 Days later, and without a word spoken to anyone – Luminescence would see herself in a bind: Running low on water, food, and injured (story of her life), she would find what she was looking for – just a mere distance away.  
Her body, weakened by great pain, humidity, and dehydration – death was as close as she was to the field of flowers, but her determination would edge her onward. One final stretch – and mere minutes from certain death – she would reach the flowers. A hoof smashing the orchid. The sap of the Orchids themselves would delicately touch the near-dead pony, only for the Dark Magic aid in the recovery of the young mare.  
Rejuvenated, the young mare was exhilarated to be back on her own two feet. The Dark Magic further fueling her body back into being. However, it wouldn’t be long before Luminescence would recall her memories of being “The Greatest” there is. However, Dark Magic, being the way it is – NEVER was specific to the idea of “The Greatest”, thus – Luminescence would begin to grow.  
… and Grow…  
… and Grow…  
… and GROW…  
… Bigger…  
… Bigger…  
… and BIGGER still!  
Luminescence was NOW a Giant Earth Pony. Fueled by ambition, desire, and determination – it would conflict with the will of the Dark Magic.  
However, Unnatural for such power to recede, the Dark Magic would be overwhelmed in a matter of minutes. Luminescence would DRAIN the Dark Magic entirely without as much as a struggle. However, in doing so, Luminescence would notice behavior changes, appearances changes, and even changes in occupation. She considered herself a “Flawless Giantess” and desired to make every last one of her whims – a reality.  
Up until now, Luminescence has been notorious for her sense of being overwhelming, ambitious, and even vain. Her current occupation however, is just trying to be recognized by ALL of Equestria (hail or high water.) She however is having… “trouble” (and by “trouble”, I refer to ponies getting smashed, sat upon, and even stepped on by her enormous form.)
 
 
Likes: Being a Giant, Growing Endlessly Huge, showing off her abilities, showing off (herself), being superior to other ponies (even if others see her as “crazy” or “vain.”) Being the biggest (although tempting when she is with friends, or those she is a BIG fan of.) …And fancy dresses… fancy dresses indeed. (Not to mention Giant, handsome Stallions.)
 
 
Dislikes: Things BIGGER than her. NOT being the Biggest (unless she is with friends that she likes, or is near her idols…) Giant Ponies that THINK they are better than her? (Irony, huh?) A certain… PINK PONY (a certain incident happened – something involving a Giant Cake, Confetti Cannons… and having to pay debts to the town, because the mayor fined her for the destruction of the town?) … Chocolate Rain. Oh… and she most CERTAINLY HATES being disrespected. (She has a way with dealing with such… “rabble” - Sitting on them, or stepping on them – flat.)
 
 
There you have it: Luminescence - who she is, why she is the way she is.. and the like.