It's on my shoulder. The Pirantroph corpse.
It was a relatively easy task.
Even though the Pirantrophs were stronger than the D-rank ones that I'm used to hunting as a mercenary, they were still pretty weak.
Their weakness is due to fact that they possess no special or unique trait, except from the fact that they can feel mana and somehow, unconsciously, through unknown means, gather it through their mana roots to form cores. And the bigger the core, the higher the rank.
I think I've heard of this in the guild too. Normal beasts have rank from F to C, with C ranks being able to destroy large buildings. And beasts that rank from B to S are no longer called beasts but monsters, and it's said that an S-rank monster is capable of wiping out a whole district.
I never even knew that monsters gathered mana until I learned it from K, because back in Ludia, I only ever haunted beasts.