About buffs
Positive effects you can stack on your own units. Each entry below links to the mechanic page where every Set-17 champion, trait, item, and augment that grants the effect is enumerated.
See also: Debuffs — negative effects you can apply to enemies — and Economy for player-side resource mechanics.
Defenses
Keep your units alive. From outright damage avoidance (Untargetable, Invulnerable, CC Immune) through HP buffers (Shield, Heal, Health Regen, Max Health) to flat damage mitigation (Armor, Magic Resist, Durability).
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Protective state where the unit cannot be selected by enemy basic attacks or ability targeting. Distinct from invulnerability (which blocks damage but still allows targeting); often triggered by HP-threshold trait passives or item effects.
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State that prevents all incoming damage for a duration; the unit can still be targeted and attacked, but takes no damage. Distinct from `untargetable`, which prevents the unit from being targeted at all.
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Protective state where the unit ignores incoming crowd control (stuns, slows, knock-ups) for a duration. The unit can still be targeted and damaged. Distinct from Untargetable (cannot be hit) and Invulnerable (takes no damage).
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Grants temporary HP that absorbs damage before the unit's real Health is touched.
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Restores Health to a unit, capped at maximum HP.
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Passive Health restoration per second, typically as a percentage of max Health. Independent of healing procs (Heal) and damage-scaled sustain (Omnivamp); the wearer just regenerates over time.
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Grants the unit additional maximum HP — flat (`+150 Health`) or percentage (`+6% max Health`). Item HP, augment HP boosts, and ability bodies that read "Gain X max Health" all land here, including Cho'Gath's per-cast "permanently gain max Health". The cross-round permanent-stat angle has its own curated landing at `/permanent`.
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The physical-defense stat that reduces incoming AD damage. Tank items, Bastion-style traits, and ability bodies that read "Gain X Armor" or "Your team gains X Armor" all land here, alongside the handful of cards that scale a bonus off the unit's Armor value.
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The magic-defense stat that reduces incoming AP damage. Many sustain items, Bastion-style frontline traits, and "Gain X Armor and Magic Resist" effects grant or scale off it; the inverse — Shred — reduces it.
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Reduces incoming damage by a percentage; a flat tank multiplier that stacks with Armor and MR.
Offense
Combat-stat boosts that increase the damage your units deal — auto-attack speed, ability power, percent damage amp, omni-vamp sustain, and crit.
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Scales with bonus Attack Speed; a payoff axis for AS-stacking carries.
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Scales with Ability Power. Damage and effect magnitudes that read "(scales with AP)" target this mechanic.
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Multiplicative bonus to all damage dealt — distinct from raw AD/AP because it applies after the type-specific scaling.
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Heals the source for a percentage of damage dealt (any type).
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Scales with crit chance / crit damage. Triggers Jeweled-Gauntlet-style crit-on-spell payoffs.
Movement
Repositioning effects that relocate a unit during combat. Dash is self-movement; Pull drags a target toward the source. The mechanic pages enumerate every Set-17 ability that triggers each.
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Repositioning movement that breaks the normal walk-to-target pathing — either a telegraphed dash across hexes or an instant blink/teleport to a new position. Set-17 sources include Quicksilver shedding effects and dashing to the farthest target, the Challenger trait dashing to a new target on takedown, and ability blinks/teleports behind enemies.
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Forced horizontal displacement that moves a target toward the source. Distinct from Knock Up (vertical airborne) and Dash (self-movement); the pulled unit is moved by another's effect.