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Blessing of the Lizard Elder
This unit's physical attacks apply a debuff that slows the target's movement speed by 8 / 16 / 24% (5 / 10 / 15% for ranged attacks) for 3 seconds and a DoT that deals 10-44 (10 at level 1, increasing by 2 damage for every level gained) bonus true damage twice. If the buff holder is slain, this buff is transferred to the killer.
The Blessing of the Lizard Elder is a neutral buff available on Summoner's Rift.
The buff can be identified by spinning red runes and a red runed circle around the champion. Because of this it is often referred to as the "red buff" or just "red". The damage dealt is true damage. This makes it valuable in killing champions who have high armor and magic resistance.
"Blessing of the Lizard Elder" (Here taken by a "Chosen" Master Yi)
As of V1.0.0.130, the red buff slows (8/16/24)% for melee characters and (5/10/15)% for ranged characters at levels (1/6/11). This makes the buff more effective when utilized by melee characters such as Xin Zhao, Udyr, or Tryndamere than it does for ranged attackers such as Tristana and Ezreal. Note however that it is easier for ranged champions to apply the slow without getting in dangerous situations and they can also use it to keep melee attackers at a distance.
The jungler will most likely take the red buff early in the game.
The extra damage lets the jungler clear minion packs easier and take on bigger monsters like the Dragon.
The slow from the buff is extremely valuable for the jungler to successfully execute a gank.
The slow from the buff stacks with all other effects that would reduce the target's movement speed, except another red buff.
For example if you are carrying a Frozen Mallet and have the red buff, both slows will be applied to the target. However, if the red buff slow is weaker it's reduced by 65%, and it's just a (2.8/5.6/8.4)% slow for melee attacks or (1.75/3.5/5.25)% for ranged attacks. If the red buff slow is stronger, the other slowing effect will be reduced by 65%
If you are a ranged attacker with both Frozen Mallet and the red buff. Attacking an enemy reduces its speed to (1 − 0.3) × (1 − 0.15 × 0.35) = 0.7 × 0.9475 = 66.325% of his original movement speed.
Increasing attack speed does not increase true damage dealt by the red buff, as the damage is applied as a non-stacking damage over time effect.