Silver/Brass/Bronze/Iron

There are 4 varieties of this magical device. Each summons a number of berserkers from Valhalla to fight for the character who summoned them by blowing the horn. 

Each variety of horn can be blown but once every 7 days. 

These horns all appear to be normal instruments until their command word is discovered. 

The type horn, its powers, and who is able to employ it are shown below:

Any character whose class is unable to employ a particular sort of a horn of Valhalla will be attacked by the berserk fighters summoned when the character winds the horn.

Fighters summoned are armor class 4, have 6 hit points per die, armed with sword and spear (50%), or battle axe and spear (50%). They gladly fight whomever the possessor of the horn commands, until they or their opponent(s) are slain, or 6 turns have elapsed, whichever occurs first.

Fully 50% of these horns are aligned and will summon only fighters of the horn's alignment. A radical alignment difference will cause the horn blower to be attacked by the fighters.