True damage

True damage is one of the four types of damage in League of Legends, the others being magic damage, physical damage and pure damage (which is only used by the fountain turrets). True damage ignores armor and magic resistance, as well as other forms of damage reduction such as, and.

Blocking true damage
Abilities or summoner spells which deal true damage are still blocked by effects that prevent damage such as the passive on, , , and Standard Attacks which deal additional true damage are still capable of being blocked by. will block all damage to a target champion, including true damage. will block all damage to any champions below 10% of their maximum health in the area of effect, including true damage. Before the removal of Dodge, both true damage as an on-hit effect and true damage on standard attack were capable of being avoided completely if the standard attack was dodged, however during the effect of, can still effectively dodge true damage from on-hit effects and true damage from standard attacks. and corresponding and  are also capable of preventing and cleansing damage over time true damage passive  and the debuff from.

Countering true damage
Although true damage cannot be directly mitigated, it is possible to diminish its relative effect by stacking health or using shields.
 * Building health causes sources of flat true damage (eg. ) to effectively deal a lesser percentage of total health. This only partially applies to, because it scales based on maximum health.
 * Reducing Vayne's attack speed (via items such as or ) mitigates damage from  by reducing how often it procs. The bonus resist/health also diminish physical damage effects, which usually comprise the large majority of Vayne's total damage.
 * For each Silver Bolt proc, bonus health is effectively equal to (1 - % True damage) * (bonus health). For rank 5, this means Bonus Health over 12 autoattacks remains 87% effective—still quite efficient. For all the above reasons, health constitutes an essential aspect of efficiently countering damage output, contrary to popular belief.
 * Absorption shields such as absorb true damage and do not count towards max health; therefore, they protect equally well vs. all sources of true damage.
 * Magic-only shields such as and the passive on  and  will have no impact on true damage.

Champions who deal true damage with standard attack

 * (upon hitting a Vital marked by  with autoattacks)
 * (triggered by autoattacks every 15 seconds on one target. Can be refreshed by destroying a )
 * (upon autoattacking champions marked as the Villain)
 * (active only)
 * (applies true damage over time)
 * (upon 3rd consecutive hit on a single target)
 * (on autoattacks, but for duration of ability only)

Champions who deal true damage with abilities

 * (upon retraction)
 * and (upon hitting a Vital marked by )
 * (only to champions marked as the Villain)
 * (only to minions, neutral monsters, and pets.)
 * (100 Fury)
 * (upon 3rd consecutive abilities on a single target)
 * (only to minions, neutral monsters, and pets.)
 * (100 Fury)
 * (upon 3rd consecutive abilities on a single target)
 * (upon 3rd consecutive abilities on a single target)

Champions who deal true damage with casting delayed or otherwise non-damaging spells
NOTE: These spells deal a 1-2 true damage for turret and minion aggression reasons, as well as allowing the caster to receive an assist.
 * deals one true damage when it is casted directly on an unit.
 * deals two true damage for each tick of the timer when attached to an enemy champion.
 * deals one true damage when first placed on a target and oddly even applies spell effects such as.
 * deals one true damage when it is casted directly on an unit.
 * deals one true damage when it is cast on an unit.

Items

 * (5 second cooldown against champions)
 * (Smiting enemy champion makes basic attacks deal true damage)
 * (Smiting enemy champion makes basic attacks deal true damage)
 * (Smiting enemy champion makes basic attacks deal true damage)

Summoner spells

 * , and  (only to minions, neutral monsters, and pets)
 * - debuff that dealing true damage on hit to champion
 * - debuff that dealing true damage on hit to champion