Mountain Unpleasant

This is where he's supposed to be i walk up a little more and finally i see him, this gigantic beast that isn't human it's scary and then it attacks me I barely escaped it but hey its better then nothingi try slashing him and it doesn't even pierce his steal armor he punches me away and I yell "I will defeat you" he says through telekinesis that "I am the strongest you won't be able to..." ONE THOUSAND SLASHS, the monster is defeated I yell " I did it!!!!!"