Rage Damage
Rage Damage is a mechanic that causes players and enemies to deal additional damage while on low health. This mechanic is currently only used by Cyanide.
The number associated with Rage Damage represents the amount of additional damage each attack will do if at 0 health. Note that normally a character with 0 health would be dead, so outside of Tag Team Combat you won't ever do the full amount of Rage Damage.