Bastion Shield

While you are wearing (armor) or wielding (shield) this
item, you can use a bonus action to press your fist to the
ground and speak its command word, causing a 10-foot
radius immobile dome of force to spring into existence
around and above you that remains stationary and lasts
for 1 minute. The dome automatically repels nonmagical
ranged attacks attempting to pass through it, and the area
inside the dome is considered difficult terrain for hostile
creatures. Once used, this property can’t be used again
until the following dawn. This item also adds +2 to AC

Notes: Bonus: Armor Class, Magic item name - Bastion shield, requires attunement - true