Nanook  vs Shion from Tensura volume 23

These are her abilities 

These are her abilities from Tensura

Her ULTIMATE SKILL IS 

Tyrant King Susanoo 

What it does?

Susanoo's essence is Minus Break 

It allows the user to counter received energy with their own energy, neutralizing it and converting it into the user's own energy. Not only that, but the target's energy can be stolen and used with the user's own attacks, allowing the user to eventually defeat any enemy. However, since the user's energy reserves are limited, they cannot become infinitely strong.

Sub abilities of Susanoo

Thought Acceleration

It allows the user to greatly increase the speed of their thought process. The user can adjust the level of acceleration as needed, as well as extend the effect to other individuals.

The exact factor by which their thought process is accelerated varies from several hundred to millions or even hundreds of millions, depending on the individual. The two most common variants are a factor of one thousand.

Universal Perception

Universal Perception allows for the perception of nearly all things within an extremely wide radius. It is an enhanced version of Mana Perception with superior sensory capabilities. The user can perceive not only light and sound — inherited from Mana Perception — but also killing intent, heat, and sound waves within an extremely large range.

Demon Lord's Haki

It combines the effects of the extra skills Haki and Magic Aura and allows the user's aura to exert a powerful spiritual pressure over their targets and inflict them with potentially lethal magical effects. It is possible for one to immediately perish if they are too weak, or cause one to lose their sanity.

Certain Outcome

A heinous ability that directly alters the laws of the world, similar to an ultimate skill. It allows the user to alter cause and effect to freely change the result of an action or the state of an object into their desired outcome, no matter how improbable. It is possible to permanently alter the status of a living being or object to make an unnatural state their natural state, which makes any form of healing useless. The only way to counter this is to also be able to manipulate the laws of the world such as via Law Manipulation or an ultimate skill and then manage to overcome the user's will with their own will.

Infinite Regeneration

It grants the user ridiculously powerful regenerative properties, vastly superior to those afforded by Ultra-speed Regeneration. Any type and amount of damage that doesn't outright kill the user can be instantly regenerated. Moreover, unlike Ultraspeed Regeneration, which can only regenerate the material body, Infinite Regeneration can also regenerate the spiritual body, the astral body and even the soul. Likewise, while Ultraspeed Regeneration can be disabled by spiritrons, Infinite Regeneration can continue working under those conditions by increasing the magicule input.

Action Alteration

It allows Shion to reshape her actions to align with the best outcome, essentially letting her make moves that forces the situation toward success.

Nihility Counter

Nihility Counter is essentially a counter‑ability that neutralizes or absorbs incoming energy and returns it back against an opponent — the “nihility” (void) aspect refers to canceling or nullifying the attack before converting it into your own force.

Fantasy Destruction

Fantasy Destruction is a passive sub‑skill that lets Shion negate or destroy things that are illusionary, “fantasy,” or otherwise not part of normal reality. It helps her bypass and break through things that rely on illusion, special constructs, or imagined phenomena, making her harder to trap or deceive with illusion‑type abilities.

Spacetime Manipulation

It is a more potent version of Spatial Domination, giving the user complete control over the element of space and minimal control over time. This allows them to perform Spacetime Connection or even Instant Motion depending on their proficiency.

Multidimensional Barrier

It boasts a foolproof defense against physical, elemental, and emission-type attacks. While there are attacks that could potentially break it, if the user is able to analyze the nature of the oncoming attack, they can adjust the barrier to block it. 

Related Arts

Chaotic Fate

Combination of Susanoos sub abilities of 

Certain Outcome and Optimal Action.

It allows Shion to manifest her desired reality while maximizing her chances of success in any given situation.

Shion is a specialist melee fighter that is prided in her brute strength and swordsmanship. Shion uses a big and heavy sword to complement her strength, which she can hold easily with one hand. The combination of her immense brute strength, massive sword and sword skills makes her a fearsome enemy to fight.

Resistance 

Abnormal Condition Nullification

is a Nullification-type skill that completely negates the effects of things such as corrosion,poison, paralysis, petrification, sleep, etc.

Holy-Demonic Attack Resistance

Natural Effects Nullification

is a Nullification-type skill that negates the effects of the four natural elements — fire, water, earth, and wind — and their derived effects like temperature, electricity, acid, etc.

Pain Nullification

Physical Attack Nullification

Spiritual Attack Nullification

is a Nullification-type skill that completely negates effects (mind control, mind reading, etc.) and damage on the mind and Spiritual body which is  basically soul.

This is after volume 23 of the Light novel! 

Me personally I think she would be a berserker

Who wins?