Horn of Valhalla Silver

As an action, summon 2d4+2 Berserkers within
60ft. They are friendly to you and follow your
commands. The berserker spirits will return to
Valhalla after 1 hour or when they drop to 0hp.
Once you use the horn, it can't be used again for
7 days.
—
Berserkers were members of unruly warrior gangs that worshipped Odin, and acted as both bodyguards and
shock troops. They were said to have fought in a
trance-like fury.