Quxfin

Quxfin is an archmage turned godkiller and planeswalker who wants to preserve her plane at all costs, even if it means conquering the multiverse.

Background
Quxfin was born under auspicious circumstances, and lived a childhood plagued by tragedy. Numerous times, she survived experiences that were expected to be fatal, from illness to being lost during a snowstorm to being attacked by animals while at sea. They were raised to believe that the gods hated them, and often wondered if they were cursed. As they grew, Quxfin took to studying magic, specializing in divination and reading the future. While their initial ambitions were small, focusing on predicting weather or warning family members when not to travel, she found herself curious how far she could push her magical talents.

On one fateful winter night, when Quxfin was fifteen, she cast bones into a fire, and asked a simple question: What should I do to realize my true potential? And amidst the sounds and smells of burning, she found that the answer was to travel to the nearest city, and apprentice under an archmage that lived there. Under his rule, she studied magic further, and began to master more and more types of spells. Yet, she still wasn't satisfied, and on the five year anniversary of that one winter night, she asked again if she had reached the limits of her potential, or if there was more to develop?

And of course, her magic told her that she could continue to grow. Now that she was stronger, however, she was able to get more specific direction, and more information from the divination spell. She resolved to continue this process, of learning, then using divination to push her own limits further and further, until she could achieve all she ever could've wanted to. But what did she want to do? She wasn't sure, and so she again turned to divination, to ask what her purpose in life was. Why had she endured such tragedies growing up?

''Your purpose is to save the world from those who would do it harm. It is to protect the many, who cannot protect themselves. It is to slay all tyrants, and lead everyone who wishes to be led by you. And the gods fear this.''

Now, Quxfin had a direction, a goal. She would become the most powerful archmage on the world, slay the gods, and let the world flourish outside of their vile clutches. It took years, but a decade and a half after she first began the journey, after she first began to study under her first master, Quxfin came disguised to The Pristine Valley, where the gods of her world lived, and challenged the first one she saw to a battle. The other gods prepared for entertainment, but were horrified when their compatriot was ripped in half, and the disguised assailant revealed their identity. Quxfin demanded that the gods surrender, renounce their powers, and live as mortals, or face her wrath.

Some complied. Others did not. And Quxfin showed no further mercy than what she'd offered. The gods on Quxfin's plane were generally known to be immortal. Magic was allegedly their gift, and could be revoked at any time. This was not a world in which gods died, or mortals triumphed over them. Quxfin was rejecting the perceived rules of reality as trivially as most people breathed. She was acting as an agent of destiny, a force far more powerful than anything else on the plane.

And with the gods killed and scattered, and humanity free from their influence, Quxfin let herself relax, and returned home, looking to start a family. But not all was well, and Quxfin awoke one morning with a gnawing hole in her stomach. Slowly, she cast the bones again, and asked if she'd saved the world. No, was the reply. How will the world end, she pried. ''Inevitably. Decay is a rule of reality you are incapable of defying. Not in a mortal lifetime, or even a thousand mortal lifetimes, but eventually the multiverse itself will end, and take this plane with it.''

Quxfin could not tolerate such an answer, and their spark ignited as they resolved to scour all the planes for a solution. If the thing endangering her world was the end of the multiverse, she would simply have to seize control of the multiverse, and destroy whatever force was gradually pushing itself towards destruction. No matter who stood in her way, gods, kings, civilizations, planes themselves, she would see her vision through, and save her home along with the multiverse.

Capabilities
Quxfin is an archmage of truly unrivaled power and skill. Despite being a post-mending planeswalker, her power is much more akin to a pre-mending planeswalker. In addition to obvious staple effects, such as teleportation, conjuring weapons, fireballs and similar elemental attacks, divination, necromancy, and time magic, Quxfin also has developed methods of harming allegedly immortal or invincible beings. While she can't necessarily kill everyone she meets, simply being a god or similar apex predator of a given plane is very far from sufficient to stop her.

Quxfin is an expert tactician, but often fails to properly utilize all the tools given to her, preferring to handle as many matters as she can on her own. She will use armies to hold territory, or promote feelings of protection, but doesn't see much value in them for acts of conquest; that's something she can simply deal with alone.

If Quxfin was not a planeswalker, they would just be the most powerful figure on their plane, and it would be a rather self contained matter. As a planeswalker, however, now their absurd power is everyone's problem.