As an action, you can cast the Light cantrip.
When you use an action to cause lightning damage to the crystal in the center, it shoots out a searing beam of yellow lightning, Each creature in a 15-foot cube originating from you must make a DC 13 Dexterity saving throw, taking 2d8 lightning damage on a failed save, and half as much damage on a successful one. Anyone withing 30ft of the light must make a DC 13 Constitution saving throw or be blinded for 1 turn.
Roll a d20. On a 1, the staff is destroyed.
Attack
15 foot cube - DC 13 Dex Save - 2d8 Lightning
30 foot cube - DC 13 Con Save - Blind for 1 turn