Slade, by nature, is an assassin. He met Beet while he was on his three year journey, around the 2nd or 3rd year. The two are rivals to each other, but not in an angry sort of way. In the present story, he meets Beet and Poala at a port town, which later becomes the battlefield where Beet and Belltoze later fight. After said fight, he impressively holds off Belltoze from killing a weakened Beet. After a long fight, Belltoze eventually defeats him, throwing him into a building and breaking an entire wall. Slade, like Beet, uses spears when fighting. He is especially skilled at using Divine Wind, normally creating small wind shuriken or using tornadoes to attack. His strongest attack is called &quot;tengeki of tornado,&quot; where he creates an enormous tornado surrounding his enemy. He then uses his Saiga, &quot;Silent Grave,&quot; to slash at his opponent. All the while, he is moving so fast in the whirlwind that he cannot be seen. His personality is best described as quiet, not talking or doing unnecessary actions. He is basically the opposite of Beet. He is also the potential fifth member of the beet warriors.    SAIGA    Slade&#039;s saiga is called Silent Grave. It is a spear saiga made of wind, and compressed to a very high limit. It is so focused, that it can cut through the skin of any vandel. Another side addition is that when he summons it, its invisible, which make it looks like he is slashing at his enemies using just his hands.

It is the dark century and the people are suffering under the rule of the devil, Vandel, who is able to manipulate monsters. The Vandel Busters are a group of people who hunt these devils, and among them, the Zenon Squad is known to be the strongest busters on the continent. A young boy, Beet, dreams of joining the Zenon Squad. However, one day, as a result of Beet's fault, the Zenon squad was defeated by the devil, Beltose. The five dying busters sacrificed their life power into their five weapons, Saiga. After giving their weapons to Beet, they passed away. Years have passed since then and the young Vandel Buster, Beet, begins his adventure to carry out the Zenon Squad's will to put an end to the dark century. 

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It's the Century of Darkness where monsters known as Vandels rule the world, and the Vandel Busters are the only ones who can fight them. When a group of Busters are killed in battle, they pass on their magic Saiga weapons to Beet, making him the strongest Buster ever. But Beet won't just fight the Vandels--he wants to destroy them and finally end the Century of Darkness.
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(Source: Viz Media)