User blog comment:Mescolinares/TRUE power of the “Horn of the Goblin General”./@comment-30010080-20170912075600

1st: the user has to be at a 'beginners level'. That is to say, their Total Levels must be 10 or below.

2nd: they must have at least 1 Job Level in [General]. OR, they must have a specific [Job] that gives the user some kind of "authority over others" (Enri's Job of 'Village Chiefta​in' for example).

3rd: they must be facing an opponent (or a group of them) who's Total Level(s) are significantly higher than their own (perhaps 40-50+ Levels more).

I've said this before, but I read somewhere that the horn is meant to be a support item for "newbs". In other words, it gives new players a chance to catch-up and explains why no one discovered this hidden feature; they were already too strong to need it.