Killed 654,321 Slimes at the Age of 18

There is no heroine + the protagonist is a lone wolf who develops alone I am the only exterminator in all the worlds. I want to become stronger for no other reason than to see what your race can bring to me. A level 100 combat professional can destroy the world at will. Level 1 warfare professionals can also master extraordinary powers. The world is beautiful and I want to visit every place. Kill every monster. Please let me kill you! ! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.