Staff of Arcane Storage

A magical staff that holds the power to store spells. 

When holding this item, spellcasters can use spell slots to store in this staff. The user may then cast spells using the stored spell slots, which takes an action and a bonus action. The maximum amount of levels of spell slots stored equals 2+ the users  proficiency bonus. 

The Staff also allows the user to cast magic missile, detect magic, and feather fall, but only by using spell slots stored in the Staff. The user can also cast counterspell regardless of if they have the spell slots required, using up all of the staffs energy in the process.

Requirements: Must be at least Level 1 in any spellcasting class.