Here's some new details pulled from the Japanese site about Groh.
Arondight Replica
Described as the "Flower of Chivarly" which was once wielded by a famous knight of great renown, it was thusly named. Although a replica of the original that Groh carries, it's modern craftsmanship likely surpasses that of the original sword. Although the Aval Organization possesses other replicas of other weapons, Arondight Replica holds a special philisophical significance within the Organization, as it represents a symbol of pride with the society.
Only those with the dedication, training, skill and rank are allowed with wield the replica weapons. After years of dedication and hard work, Groh was promoted to the Twelfth Seat receiving the Arondight Replica from his instructor Odr. However, Groh's position within the Order is precarious. After a failure in dealing with the Azure Knight, Groh lost his seat and confusion within Aval Organization has placed Groh in a position where he must earn his place again with his next mission.
Aval Twin Swordsmanship
One of the martial styles taught within the Aval Organization.
Since its establishment in medievil times, the Aval Organization has developed martial styles for a variety weapons from, swords, spears, shields and wearing heavy armor. With the passage of time, the Organization adapted and abandoned the use of heavy armor and helmets for more practical techniques, and lighter clothing and armor.
The techniques of twin-swordsmanship through creative ideas and cultivated through training and form. It's unusual style created unique advantages for the wielder with the ability to attack with both ends of the weapon. But the dangers of self-injury were great, requiring incredible skill in order to handle the weapon properly.
The techniques also included instructions on how dual wield swords and attack the opponents in aggressive, close-ranged flurry. Together, the techniques were intended to create unpredictability and force the opponent into a guessing game of whether to attack or disengage.
In the end, Groh was ultimately dissatisfied with the style's lack cohesiveness, and instruction. Merging the two-styles into one cohesive form, he created a brand new style and name for each technique despite opposition within Organizations more conservative circles. Eventually they relented when it became apparent that Groh's new techniques were both practical and teachable to their peers. With his success in creating a new style for the organization, he named it the "Aval Twin Swordsmanship" after the organization in to establish it legitimacy