The Horadric Staff
Cain tells you that The Horadric Mages, after binding Baal within Tal Rasha, magically
sealed off his Burial Chamber from the mortal realm. Those same Mages also crafted
fearsome Horadric Staves and imbued them with the special power to open the Chamber's
hidden door.
After nearly losing one to the thievery of a rogue sorcerer, they divided all the
Horadric Staves into two parts - wooden shaft and metal headpiece - hiding them
separately to safeguard them.
The Horadrim foresaw our current plight and designed the hiding places to reveal
themselves to worthy heroes like you.
Collect both parts of a Horadric Staff and unite them using a Horadric Cube. Then,
you may enter Tal Rasha's Burial Chamber.
Given by Cain after returning the Horadric Scroll that is found in Radament's Lair.
Tip: Search the Halls of the Dead for the Horadric Cube, search the Sand Maggot Lair
for the Horadric Shaft (Staff of Kings), search the Claw Viper Temple for the Horadric Amulet (Amulet of the Viper). Find
Tal Rasha's Burial Chamber.