This staff can be wielded as a magic quarterstaff that grants a +2 bonus to attack and damage rolls made with it. While holding it, you have a +2 bonus to spell attack rolls.

The staff has 3 charges and regains 1 charge at each dawn. If all charges are used the staff explodes into 20 ft radius sphere of gas that knocks all creatures within it unconscious.

You can expend 1 charge to create a 15 ft radius sphere of noxious gas centered up to 100 ft away that reduces any creatures AC by 2 and half's there speed unless they are a aberration. A dispel magic spell or gust of wind spell can get rid of the gas. 

Notes: Bonus: Magic, Bonus: Spell Attacks, By a spellcaster, Creation, Control, Communication, Detection, Warding