This is a skill that Tzarakks use to turn the corpses of certain species of monster into trophies. When hung in the appropriate spot in the Temple of Tzarakk, these trophies let them advance to greater levels of skill and power than might otherwise be possible. It is said that the more skilled a Tzarakk is in trophy creation, the smaller the monster they need to kill to create a trophy suitable enough to appease their god.

Needless to say, only monsters killed without any help are suitable for trophy creation.

The ingame help reads:

Skill duration: 1.
Type of skill : neutral skill.
Affecting stats: Dex.
It uses 15 endurance points.
This skill is used for creating hunting trophies from the corpses of dead
animals. When displaying corpses in trophy halls, Tzarakk will give additional
gifts to those who respect his power by murdering beasts in his name. As
Tzarakk has personal pride over his slaves, it goes without saying that to
gain respect of the hunter god, the blood of the victims must be shed alone.