Warhorn of Mogis

Wondrous item, legendary (requires attunement by a devout worshiper of Mogis)

Price: 100,000-240,000 gp | high sentimentality

This warhorn is carved from the horn of a minotaur, and Mogis only graces the most ferocious warriors with such a magic horn. Worshipers of Mogis (which typically include all Theran minotaurs with rare exceptions) covet such warhorns and go to great lengths to take one for themselves. If they discover you possess such a warhorn, they attack you to obtain it.

Bound by Blood. You can’t end attunement to the warhorn unless you die, lose the favor of Mogis, or use the wish spell. A creature that kills someone attuned to the warhorn automatically becomes attuned to the warhorn.

Paid

When you blow the warhorn, all worshipers of Mogis within a mile of you are unable to attack you for the next hour and must make a DC 20 Wisdom saving throw. If they fail, they must obey any orders you communicate to them that they can understand for the next hour. During this time, they cooperate with each other to achieve your intended goal to the best of their ability, behaving like a disciplined army unless you explicitly order discord amongst their ranks. They don’t need to obey an order to harm themselves. Once the effect ends, they become immune to the warhorn’s effects for the next 24 hours.

Overpaid

Once a day for the first ten days after you attune to the warhorn, you may cast the commune spell without requiring material components to contact Mogis.

Source: The Gray Merchant of Asphodel