Martyr's Rally

3rd-level enchantment
Casting time: 1 reaction, which you take when you are reduced to 0 hit points
Range:Self (60-foot radius)
Target: Each ally within 60 feet of you that can see and hear you
Components: V
Duration: 1 minute
Classes: Paladin
Subclasses:

With a hopeful rallying cry just as you fall unconscious, you rouse your allies to action. Each ally within 60 feet of you that can see and hear you has advantage on attack rolls for the duration. If you regain hit points, the spell immediately ends.