Master Swordsman: Serde is a master of swordsmanship, possessing flawless precision and performing lethal attacks with little effort.
Master Magician: Serde has considerable knowledge of high level spells, casting several in quick succession, with almost no effort, and still possessing formidable power. He possesses advanced knowledge of magic application and consistency. He can use a low-level spell repeatedly in rapid succession and with devastating effects, as well as a counter to attacks. He once uses a low-level lightning spell to burn a hole right through Sirtreize Lucifer's shoulder.
Master Tactician: Serde is a highly perceptive fighter, almost immediately determining an opponent's attack patterns and weaknesses. He is a crafty tactician, effectively using magic to confuse his opponents. He can discern the motives and abilities of his opponents, and effectively uses his knowledge to end the battle in his favor.
Immense Demonic Power: He can exert an immense amount of Demonic Power, which, in addition to his already admirable combat skills and finesse, makes him one of the most formidable members of the Astaroth Clan to date. His Demonic Power can be felt from a great distance, and it has the tendency to make weaker people perspire in fear.
Vibrant Display of a Thousand Blades: As a member of the Astaroth family, Serde possesses the ability to make his Demonic Power tangible by compressing it into blades. Serde's ability with this power is the most skillful to ever be seen from the Astaroth family. He is able to create thousands upon thousands of tiny, slender blade fragments which bear a striking similarity to sakura petals - especially with the pink coloration to Serde's aura. Serde can control the blade fragments, allowing him to shred opponents at a distance and break through almost any defense. The blades can be used for defensive purposes, as they can protect Serde from an incoming attack by being gathered together.
Senkei (殲景, Slaughterscape): The true form of Serde's power. This unites the scattered blades into complete glowing swords, numbering in the thousands, which form four rows. These rows float just above each other, and circle around Serde and his opponent in a continuously moving, column-like array. It abandons defense in favor of a concentrated offense. Though visually menacing, this form is not meant for attack from all sides; rather, it concentrates his ability into fewer blades, thus increasing his attack power. While Serde can still mentally control these swords, he commonly calls them to his hands for actual melee combat. When in his hand, they lose their glow, and take the form of a proper katana. It seems to take fewer blows from a Senkei blade to gravely injure an opponent than the multiple cuts needed from the unfocused power. Senkei - in its full form - seals Serde in with his enemy, allowing neither combatant to move very far from each other, though the area is still large enough for maneuverability. The deadliest aspect of the Senkei form is that it allows for use of all the swords at the same attack level, making it a way to effectively defeat an enemy unaware of the danger of the situation. It is extremely rare for Serde to use this ability, doing so only when he has sworn to cut down the opponent with his very own hands.
Gōkei (吭景, Mawscape): This form increases the number of tiny blades immensely. It creates a spherical formation of innumerable blade fragments, which swirl around the opponent like a cloud before flying into them from every possible angle, leaving no blind spots and no possibility of escape. It proceeds to collapse in on itself, obliterating the opponent. When used, the resulting shockwave generated by the attack forces even Serde to distance himself.
Shūkei: Hakuteiken (終景: 白帝剣, Endscape: White Imperial Sword): This condenses each and every one of his blades into a single, potent sword, drastically increasing its cutting power. The demonic energy and pressure released by this form is immense. The blade appears bright white, and its aura takes the form of a bird, earning it the name Hakuteiken (白帝剣, White Imperial Sword). Pure white wings form on Serde's back, as well as a halo-like circle, made of concentrated spiritual energy. This form's blade can create aggravated injuries in a single blow. The wings can be used for flight. Serde states that he developed this form decades ago to combat the advanced forms of Balance Breakers in Sacred Gears.
