The earth tiger battle and the katana

Hearing that Ren could go to the earth tiger dungeon( an a rank dunegon)  and get everything to meet the conditions he went straight for it just at the eastern gates he saw people making huge parties to go in but he went alone people wishpered behind him is he crazy... he will die if he goes alone after hours of searching 

Ren finally reaches the boss room in front of him a tall tiger covered in mythical stone tablets he attacked swiftly with his paws Ren barely dodged Ren attacked with everything poison bullets fire explosions lightning spears but none of them worked after fighting for a long time Ren got heavely injured he saw that his poison bullets are causing little cracks in the tigers defenses Ren decided that if

 he would somehow explode the poison he could kill the tiger but the radius will kill him too that's why 

Ren slowly dodged the tiger while making a huge contraption of poison moving right beneath the tiger

 while Ren was thinking how to to ignite the explosion vaels teaching echoed in his mind elements are not power...they are control 

Ren slid beneath the tiger caused sparks with his fire to the minimum and then boom the tiger collapsed but it was still standing bleeding roaring in rage 

Ren said :-fine if I die I am gonna take you with me AARAAGHHHHHH ancient symbols appeared beneath the tiger forming a circle of flame tornado but the flames changed color during activation from crimson to black Ren saidwhat t was that ?( in shock ) 

  then he got a red glowing core of the Earth tiger with the money and the magic ores he got back to brok gave him the core as the stabilizer the 50 magic ores and the1 million 500 thousand as promised brok said fine 

Give 7 days to make the katana after all it will be my best work until now after a week 

Ren finally got his katana brok said carefully kid this thing almost burnt my whole forge then as soon as Ren hold the katana something whispered in his ear raikoku brok said :- what ? The sword named itself that's a sign meaning the sword Is forged correctly kid .Then suddenly royal gaurds came asking Ren to go with them because the king is calling him ...