Feral Rage

When another PLAYER character fails a death saving throw player may choose to enter a feral rage

FERAL RAGE

Player becomes taunted, Disadvantage on all attacks except against enemy nearest fallen comrade, -1d4 to all heling (to a minimum of 1)

 Only DM knows HP total

Advantage on all attacks against enemy nearest fallen comrade, +1d8 Damage critical hits on 18-20

Feral Rage only ends upon death of said enemy or combat otherwise ends