Vasco is a natural-born Holy sword wielder.
- High Durandal Compatibility: Vasco has an incredibly high level of compatibility with the notoriously picky Durandal. His compatibility is so great that some theorize that his ability to use Durandal surpasses that of Roland, the original wielder of Durandal.
Immense Exorcist Skills: Vasco is an extremely powerful exorcist, being able to slay even the most powerful of Devils by relying solely on his own skills, as seen by him being able to defeat Kokabiel, a Fallen Angel Cadre, in his youth. According to Rias, even the current Satans (including Super Devils Sirzechs and Ajuka) feared Vasco in his prime. Even in his old age, he remained immensely powerful he held the upper hand against the Gremory Group consisting of Issei in his Cardinal Crimson Promotion and Saji in his Malebolge Vritra Promotion. After he was restored to his prime, Vasco overpowered Vali in Empireo Juggernaut Overdrive, Bikou, a weakened Fenrir, and Gogmagog singlehandedly.
Master Swordsman: Vasco is an extremely skillful master swordsman able to overcome master swordsmen like Kiba and Xenovia with minimal effort. Using the Durandal Replica, he was able to bifurcate Rias' Extinguished Star, a highly destructive technique even for the tough scales of Evil Dragons, and fought on par with Arthur Pendragon who is a tremendously skilled master swordsman who also wielded Caliburn, the Strongest Holy Sword.
Master Hand-to-Hand Combatant: Vasco is also a skilled master hand-to-hand combatant whose skills are also further supplemented by his immense physical abilities, as shown when he could block Irina's Hauteclare with his fingers, caught and crushed Yuuto's
Sword of Betrayer just by gripping it, and threw extremely powerful punches that could destroy buildings simply from the shock-wave generated from his fists. Rias even noted Vasco's hand-to-hand combat prowess is on par with Sairaorg's, a Devil who is an extremely powerful martial arts master.
Immense Strength: Vasco has tremendous physical prowess due to having gone through constant training in his youth. Even as an old man, his punches are as powerful as Sairaorg's despite the former being a human. During his initial encounter with the Gremory Group, he was able to stop Issei by merely placing his hand on his shoulder using enormous pressure. Vasco was able to swing the Durandal Replica using enough force to match the speed of Kiba with even Ewald Cristaldi, a strong exorcist in his own right stated that he was a true monster. Bikou even compared his strength to the First-Generation,
Sun Wukong and Vasco overpowered Bikou and Gogmagog, then countered the golem's rocket punch using a single punch. Upon being restored to his prime, he had sequentially overwhelmed Gogmagog, Bikou, a weakened Fenrir and Vali in his Balance Breaker even breaking his silver-white armor. Vasco's anomalous strength even terrified some of the Gods in the Rating Game. He is regarded by many as the strongest human being.
Immense Durability: Vasco was able continuing to fight after take many attacks from Ouryuu in his dragon form and earth manipulate, Irina countless light bullets and Xenovia Cross Crisis technique, as result into crashing to a building.
Immense Speed: Vasco is shown to be extremely fast, able to catch Devils and Angels by surprise despite being a human and of senior age. In Volume 24, after returning to his prime he displayed enough speed to leave behind afterimages and outmaneuvered Vali in his Balance Breaker.
Immense Stamina: Vasco has massive stamina; despite being an 87-year old man, his physical abilities have not been tarnished. Instead, he remained just as strong as ever able to fight against the extremely powerful Gremory Group without tiring out, however, his stamina has notably been depleted compared to his youth, as evident as he showed signs of fatigue after a short battle with Arthur Pendragon.
Sacred Fist: Vasco is able to fuse holy power into his punches, letting him damage beings that are weak to holy energy even without the use of holy swords. Augmented with his tremendous physical strength, he can cause an immense amount of damage to Devils.
Magic Neutralization: His immense experience and knowledge born from his years of fighting against Magicians and those who use magic, letting him locate even the tiniest flaws in his opponents' magical attacks and lets him neutralize them via the application of brute force to very specific points on the magic attack.
Magic: Vasco can use magic to store away Durandal II in another dimension and summon it back when he needs to use it.
Immense Combat Skills: Ever since he was a young exorcist, Vasco possesses tremendous skills in both armed and unarmed combat. Azazel mentions that he almost defeated Kokabiel during World War II. He single-handedly took on several members of DxD with minimal effort and could fight on par with Arthur, both an immensely strong and skilled master swordsman, which in the end goes in the favor of team DxD because he lost a lot of stamina which was due to him taking on the entire team alone.
Flight: During the events of volume 20, Vasco demonstrates the ability to stay afloat in mid-air.
