Wondrous Item, very rare
You can use an action to blow this horn. In response, 4d4+4 warrior spirits from the Valhalla appear within 60 feet of you. They use the statistics of a berserker. They return to Valhalla after 1 hour or when they drop to 0 hit points. Once you use the horn, it can't be used again until 7 days have passed.
If you blow the horn without having proficiency with all medium armor, the summoned berserkers attack you. If you meet the requirement, they are friendly to you and your companions and follow your commands.
Notes: Summoning
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ape together strong
This a fantastic item for when you need to tie up a large area with a bunch of quick hitters or surround yourself or a caster with a "meat shield" vs. melee attacks. The 1 use with a 7-day recharge period is a big pain in campaigns that have a ton of action over only a few days, so try to save it for the Big Bad, if you can..