Horn of Flies

Wondrous item, legendary (requires attunement)

Made of wrought brass, this object is sacred to the worshipers of The Lord of Flies. The pitted, corroded, and singed surface of the horn is covered by ornaments depicting swarming flies.

When use an action to blow the horn, you can have the horn casts bane or insect plague. If you are not a follower of the Lord of Flies, you may use each of the features once per long rest. If you are a follower of The Lord of Flies, you may draw forth insect plagues seven times per between long rests and cast protection from evil and good three times.

A lawful or neutral character in possession of the horn risks spiritual taint, and must roll a DC 15 Charisma saving throw every week of being attuned to the horn or move one step towards the chaotic alignment. Even on a touch, the horn leaves an indelible blackness on the member or lips touching it—only remove curse or the equivalent can remove it. If the horn is attacked (a futile effort trying to harm it—AC 25, immune to bludgeoning, piercing, and slashing damage from non-magical weapons, 70 hp), it sounds on its own and summons 1d6 giant flies.