There's a question: How do adventurers come to know the names of every elite or boss monster?
In fact, the way each name is known is different.
Some are discovered by glancing at the hunting manual after the fight, while others are guessed through various hints during earlier exploration, exemplified by the [Molten Furnace Knight] and [Pope Shalivan's Phantom].
And some special monsters have their names appear in large magical letters when they appear, just like the names of various areas, accompanied by stunning effects that enhance the shock value significantly—like the [Biomimetic Tear Drop of the Full Moon Queen].
Given that Fanen and his group lacked a hunting manual, they first learned the name of the elite monster [Clergy Beast] they encountered from the items it dropped later on.
Father Gascoin clearly hadn't reached the level of the Full Moon Queen's Biomimetic Tear Drop, as there was no stage where a real name was revealed.
