Your apprentices will need 10.000 gold. However it is not certain that they will be able to create the item, and all the three of them will surely die in the attempt.
It grants the user +2 to Armor Class and saving throws. Globe of Invulnerability and Lightning Bolt of Paralyzation (10d6 electrical damage to all in path; stuns target for 5 rounds; range: 100 ft.) can be used as charge abilities. They both consume one charge.
|“||A mage's staff is far more than just a gilded walking stick, most being enchanted to an impressive degree. This one is no exception, and whoever the previous owner was, they were powerful indeed. It enables a mage to better escape hostile magic and avoid physical blows, and can erect a Globe of Invulnerability (one charge). Offensively it can be used in melee very well, and cast a Lightning Bolt (one charge).||”|