Archangel's Staff

If you roll a natural 18, 19, or 20 on initiative, gain a spell shield for the rest of this round. This spell shield gives you resistance to all damage, makes you immune to spell effects, and gives melee attackers disadvantage when they attempt to hit you. If you roll a 1 on initiative you may roll again but you must use the second roll even if it is a 1. If you fail a saving throw, you may harness the staff's power to automatically pass. This drains the staff of all its power making it useless until you meditate with it on your next long rest. 

Notes: Spellcaster