Grievous Wounds

Grievous Wounds is a debuff that reduces all healing received by 40% / 60%.

Sources

Champion abilities

Items

Spells

Ignite (40%)

Notes

Shields are a way of temporarily adding health to a champion that is not reduced by Grievous Wounds.
A champion debuffed by Grievous Wounds has the icon on top of them.
- The size of the icon is bigger based on the percentage application (60% has a much larger icon than the icon for 40%).
Grievous Wounds does not stack; the duration of the debuff will overlap on separate effects and refresh on the same effect, while prioritizing the most potent application.

Type	Heal and Shield Power	Spirit Visage	Revitalize	Grievous Wounds
Health regeneration
Life steal
Spell vamp
Drain effects
Self heals
Self shields
Incoming heals
Incoming shields
Outgoing heals
Outgoing shields
Bonus health

Strategy

Grievous Wounds is generally used to limit or minimize the healing, spell vamp, or life steal of one enemy champion ability such as Darius' Decimate, Renekton's Cull the Meek or Sylas' Kingslayer. It can also weaken burst healing champions such as Aatrox, Dr. Mundo, Fiora, Swain, Trundle, Vladimir, Warwick, or Zac.
- Grievous Wounds isn't only useful against champions with in-built sustain. Some can build viable items or take runes that give them sustain, such as Death's Dance, Bloodthirster, Conqueror, or Legend: Bloodline. Grievous Wounds is also useful against them. This is important to notice especially in situations where technically there are no champions with natural sustain on the enemy team, but they may own or have sources of bonus effects that would grant them sustain.
- On the other hand, some champions only have sustain when out of combat. This includes Garen, Tahm Kench, and champions that build Warmog's Armor. Grievous Wounds is not effective against those champions (as the debuff usually doesn't last long enough for it to have effect on them); the most effective way to prevent them from healing is to force them to stay in combat.
- It is important to note that Grievous Wounds also affects healing from outside sources instead of just self-healing. This is especially important against Soraka, which can use Astral Infusion to out-sustain her enemies, even if her allies don't have sustain themselves.
Grievous Wounds is dispelled by Sion's Glory in Death and death. It will however persist through resurrection effects (e.g. Zilean's Chronoshift, Guardian Angel).