The royal summon

When Ren was summoned to the kingdoms hallway he saw king thrain iron blood standing at his right was the army general grom valkhar covered in scars all across his body then saw the magic unit captain seraphine vale the king spoke first :- 

A human with a dragon kings bone wants a katana defeats the earth tiger you got some nerves kid tell us what do you want Ren speaks :-

 Nothing I just wanted a katana that's all if you give me permission I will leave quietly king then seraphine spoke :- hmm you not only have the dragon sword but you also have the ancient devover inside yourself quite interesting you are ( the king and everyone around them got shocked ) 

then seraphine requested I can help you manifest some if it's power but it will be very harsh you know the king didn't raise a question because he knew that if he captured Ren or declared him a threat

he and his nation would be doomed then grom shigned and said fine ... I will teach him swordsmanship Ren decide to stay in the capital to train he got through harsh training every day 

specially with seraphine because drawing out the black mandas power was no joke it needed high concentration of your mana in a single place but even through that under a month Ren

 learned the half devover form engraving his right side with skin like the black manda and one of his eyes turning gold 

he also mastered swordsmahip then he headed to the elven kingdom to learn more about the black manda and himself the king said to Ren ( before Ren left ) be carefull kid elvesdont accept anyone easily they might attack you on sight