Aegis

+2 to AC, Spell Save Dc, and Spell attack bonus.
While attuned to this item you may cast shield at
will.
Aegis of the Ages - As a reaction you may summon
a huge wall of spectral energy, giving yourself and
all allied creatures with 20 feet of total cover from
all attacks until the end of the current turn. You
may use this feature a number of times equal to
your Wisdom modifier, you must then complete a
long rest before you can use this feature again.