Staff of Swarming Spiders

The staff of Swarming Spiders of a magical staff. It was found on a drow priestess in the Underdark as the group was travelling to Thoz’Undekkenia.

Description
This staff has 10 Charges and regains 1d6 + 4 expended Charges daily at dawn. If you expend the last charge, roll a d20. On a 1, a Swarm of spiders consumes and destroys the staff, then disperses.

Spells: While holding the staff, you can use an action to expend some of its Charges to cast one of the following Spells from it, using your spell save DC: Giant Insect (4 charges) or Insect Plague (5 charges).

Insect Cloud: While holding the staff, you can use an action and expend 1 charge to cause a swarm of harmless flying insects to spread out in a 30-foot radius from you. The insects remain for 10 minutes, making the area heavily obscured for creatures other than you. The swarm moves with you, remaining centered on you. A wind of at least 10 miles per hour disperses the swarm and ends the effect.