Horn of Valhalla (Iron)

You can take a Magic action to blow this iron horn. In response, 5 warrior spirits from the plane of Ysgard appear in unoccupied spaces within 60 feet of you. Each spirit uses the Berserker stat block and returns to Ysgard after 1 hour or when it drops to 0 Hit Points. The spirits look like living, breathing warriors, and they have Immunity to the Charmed and Frightened conditions. Once you use the horn, it can't be used again until 7 days have passed.

Using this horn requires Proficiency with all Martial weapons. If you blow it without meeting that requirement, the summoned spirits attack you; otherwise they are Friendly to you and your allies and follow your commands.