Kyo Ethnina/Powers and Abilities

Abilities
He was a genius, able to study, control, and go around many phenomena, including the summoning of an artificial Wave of Catastrophe, controlling Spirit Tortoise's power, etc.

He held the Vassal Book against its will and was well versed in its power. However, since his vassal weapon opposes him, he wasn't able to use all of his powers, and even after implementing many more power up methods than the other heroes, the true chosen heroes were still able to fight against him.

Most dangerous among his abilities though is his status as a Reincarnated individual. Whenever he dies his soul is able to wander free of his body to take on a new one, oftentimes the homegrown humonculi that he has made and modified specifically for the purpose of housing his soul and improving on his original.

Spirit Tortoise
A spell which summons a mandala pattern in the surrounding area, in said area Kyo can control gravity itself and immobilize enemies along with their projectiles. However, if the mandala pattern on the ground is disturbed, the effect weakens. This spell is powered by the Spirit Tortoise. Creates the same cross-dimensional rifts that manifest during the waves. This allows Kyo to transport between Raphtalia's World and Glass' World as he pleases. He can also use it to force others to teleport or can lay traps in the spell like the one that sent Naofumi and Rishia to the Infinite Labyrinth. It seems like this skill is powered by the Spirit Tortoise energy.
 * Unnamed Gravity Field Magic
 * Waves of Destruction: Dimension Wave「災厄の波・ディメンションウェーブ Saiyaku no Nami Dimenshon Ueebu (lit. Waves of Calamity - Dimension Wave)」

Vassal Book

 * Composition Form One: Bird of Flame「文式一章・火の鳥 Bunshiki Isshou Hi no Tori (lit. Formation Paragraph First Chapter - Phoenix)」

The Pages of the Vassal Book gather into one place, transforms into a flaming bird before shooting towards the target. Kyo throws a glass bottle which shatters and release a puff of green smoke. The spell's targets are strengthened as the air fills with the sound of buzzing insects.
 * Expanding Composition Form Six: Invigorate「拡張文式六章・活性 Bunshiki Rokushou Kassei (lit. Expanded Formation Paragraph Sixth Chapter - Invigorate)」


 * Redacted Skill「文式五章・列破 Bunshiki Goshou Reppa (lit. Formation Paragraph Fifth Chapter - Blast Line)」

A flutter of pages creating strong shockwave that expands from Kyo. This skill is for some reason not written in OPB's translation of Volume 7. The Vassal Book launches a stream of pages to cut into the target. Kyo considers this the most basic composition of the Vassal Book. This skill summons a roaring flame in the shape of a demon. This flame then charges toward the target.
 * Unnamed Flying Page Attack「一式一章 Isshiki Isshou (lit. Formation One First Chapter)」
 * Composition of Flame「業炎の章 Gou En no Sho (lit. Chapter of Karmic Fire)」


 * Unnamed Yuki-onna formed Ice Skill

This skill summons freezing ice in the shape of a Yuki-onna which charges towards the target. This skill is supposed to come after the skill Composition of Flame where it charges towards Rishia from behind Rishia (to which she destroys with the hilt of her sword) but it was mistranslated as swords of ice that flew from the back of the room.. A skill that turns an opponent's magic power into flames that fall from their body, leaving them nearly drained. A skill that steals an opponent's magic power and creates an attack from it that damages them. An ability that uses the enemy's attack power and creates blades of light that damage them. Most useful in a closed space. Turns the surroundings into a white room, and Kyo can bombard an opponent with many kinds of magical attacks from every angle. Summoning birds made of lighting and fire, energy beams, and boulders all at once. A cage emerges from the pages of the Vassal Book which can ensnare its targets A continuation of Constriction. Needles grow on the ceiling of the cage which then rains down on the captured targets. A skill which fires lighting from Kyo's pages which hones in on targets. An ability from the Vassal Book curse series. Kyo fires feathers from his book, which then all release small energy beams that come together and form one big black energy beam to fire at an opponent. Some feathers can also be used to heal Kyo's wounds.
 * Flame Formation: Magic Explosion
 * Rot Formation: Magic Explosion
 * Light Formation: Force Explosion
 * Libraria
 * Composition Four: Constriction
 * Composition Four: Constriction → False Ceiling
 * Composition Eight: Divine Punishment
 * Revelation