Horn of Valhalla: 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
 

Die Roll	Type of Horn	Berserk Fighters Summoned	Usable By	XP	GP
1-5	Silver	4-10 2nd level	any class	1k?	15k?
9-15	Brass	3-9 3rd level	C, F, T	1k?	15k?
16-18	Bronze	2-8 4th level	C, F	2k	30k
19-20	Iron	2-5 5th level	F	3k	45k

<colors><not sure about xp, gp>

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, <Barbarians>
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.

Horn of Valhalla