This item can be simple or elaborate, but remains a staff. It can have up to 25 charges and acts as a magical weapon, +1 to hit, +3 to damage. If the proper command words are known it can perform the following, all at 12th level:
Knock (1 charge)
Passwall (2 charges)
Phase Door (3 charges
Sundering* (3 charges)
*Sundering is a variation of Disintegration that will automatically shatter any Force Wall or similar effect - Sundering has a range of 30'.