Guardian Emblem

[Requires Attunement by a Cleric or Paladin]
As an action, you can attach the emblem to a suit
of armor or a shield or remove it.
The emblem has 3 charges. When you or a
creature you can see within 30 feet of you suffers
a critical hit while you’re wearing the armor or wielding the shield that bears the emblem, you
can use your reaction to expend 1 charge to turn
the critical hit into a normal hit instead.
The emblem regains all expended charges daily
at dawn.