Black Dragon

The Black Dragon is an enormous dragon that is the boss of Tonnesgrave.

Overview
Originally, in the vast land of Aorsoi, this dragon wasn’t a particularly enormous or difficult enemy. It was a level-85 full-raid monster,twenty-four Adventurers around level 80 could have defeated it.

It was normally found guarding the ruined base of the iron pillars that was the defying feature of the location.

Abilities
As a large dragon it had the ability to fly and can use it's tail to deal out deadly swing attacks, it had the ability to shoot black lightning from it's mouth which caused a lot of damage.

It had a high amount of stamina and hp but it was not as maneuverable as a garnet dragon.

While under Rasphuia's control it was rendered nearly invulnerable thanks to her ability to transfer souls and names thus most of the damage it took was transferred to other monsters than itself.

Skills
Lightning gathered in a black, warped space, then shot from the Black Dragon’s mouth
 * Negative Thunder Breath

Kanami Go East Arc
The Dragon was found in a slumber state but by both Papus and Rasphuia and using a mysterious form of art, Rasphuia had managed to take it under its control and also used her abilities to transfer the names and souls of other minions under her control into the Black Dragon so it would be rendered invulnerable to take direct attacks and instead transfer them to her other minions.

They used the Black Dragon as they needed to destroy the Iron pillars of Tonnesgrave in which they refereed to it as the Corridor to the Heavens, The Lelang Wolf Cavalry had tried to stop the dragon and the two genius twice but at both times they were wiped out.

Awhile Later, KR and Leonardo with the help of Ga-tan flew on her back to Tonnesgrave in order to handle the Dragon themselves but by the time they got there, it managed to destroy the Iron pillars, it was than they noticed the two geniuses riding on top of it.

Leonardo managed to tackle down both of the geniuses from the dragon while KR drew the dragon away from the area. As both KR and Ga-tan engaged the enemy in aerial combat, it proved to be to difficult, so KR had decided to dissolve Ga-Tan's summoning contract so her full abilities would be able to unlocked and thus with her full capabilities and KR's support they managed to defeat it,

However KR still took to much damage from the fight and it had resulted him in passing out and and dying from the falling, he later revived back in the Yamato Server.

Trivia

 * The Anime skipped over the part where it is taken over by the Genius as well as the following fight with KR and Ga-tan.