Monster Slayer's Kit

Source
This item is a quest reward from, given by an in capital cities or at Light's Hope Chapel in Eastern Plaguelands.

Inspiration
This item appears to be a reference to the famous video game series Castlevania in which the 4 most well-known secondary weapons are: a overhead arcing axe, a fast-flying dagger, a bottle of holy water that burns monsters, and a cross that flies out and returns as a boomerang.