??Azan-gund "Night Caller":

::This whistle is carved from rare transparent iron (nephelium), and it resembles a small dragon curled up like a snail.  The name //Azan-gund// is etched on the whistle in Dwarven runes.  A detect magic spell reveals a faint necromantic aura, while an identify spell reveals how the item works. 

When the whistle is blown over a grave in darkness or at night, one corpse below animates, as per //animate dead// cast at 5th level and claws its way out (if interred in soft earth or under loose stones).  The zombie or skeleton serves the whistler faithfully until it is destroyed.  A bearer can use the whistle once per tenday; the whistler can acquire no more than 10HD of undead in this manner. Good-aligned characters risk an alignment change if they use it regularly.  A successful Knowledge (Arcana) check or bardic knowledge check (DC 15) reveals that ancient "dark" dwarves made several such whistles for various groups in an age past.

Faint necromancy; CL 5th; Craft Wondrous Item, //animate dead//, Profession (blacksmith), 1 lb. of nephelium; Price 3,000 gp; Weight 1 lb.

Updated to 3.5 rules. Original Source (Sunless Citadel).!!