Raid Shadow Legends – Weaken debuff is one of the strongest debuffs in Raid Shadow Legends. Anyone with Weaken will take 25% or 15% more damage from your damaging abilities. It is important to try to get weaken on the Clan Boss and against all major boss fights to get the most out of your damage.
Weaken does not affect the damage of poison or HP Burn.

Weaken 25%                  Weaken 15%