Ability power

Ability power (AP) is a champion statistic that increases the effectiveness of most abilities. It stacks additively.

Effects that benefit from ability power receive a bonus based on a certain percentage of a champion's current ability power. For example, if a spell deals 100 (+20% AP) damage and a champion has 50 ability power, the spell's damage will increase by 10. In-game, spell descriptions do not display the percentage, but do display the resulting bonus; the previous example would display as 100 (+10).

Increasing Ability Power

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Items

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Variable Availability

Summoner's Rift, Twisted Treeline, Howling Abyss Template:Ile
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Summoner's Rift, Howling Abyss Template:Ile
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Summoner's Rift, Howling Abyss Template:Ile

Champion Abilities

Note: Only the ability power buffs of these abilities are shown here. To read more information on each of these abilities, follow the links to their champions' pages.

Galio's Runic Skin adds 50% of his total magic resistance to his bonus ability power.
Singed's Insanity Potion grants him 35 / 50 / 80 ability power for 25 seconds.
Taric's Radiance grants himself 30 / 50 / 70 ability power, and grants nearby allies half of that amount.
Thresh's Damnation passively generates souls for him to collect, with each soul collected permanently granting 0.75 ability power.
Veigar's Baleful Strike permanently grants him 1 ability power when the ability kills a unit and passively grants him 1 / 2 / 3 / 4 / 5 ability power when he kills a champion from any damage source.
Vladimir's Crimson Pact grants him 1 ability power per 40 bonus health.

Masteries

Mental Force increases your champion's ability power by 0.33 / 0.61 / 0.89 per champion level (6 / 11 / 16 at level 18).
Arcane Mastery increases your champion's ability power by 6.
Archmage increases your champion's ability power by 2 / 3.5 / 5% per rank.
Arcane Blade causes your champion's basic attacks to deal bonus magic damage equal to 5% of your Ability Power.

Neutral buffs

The Hand of Baron buff grants up to +40 ability power (among other bonuses) for 3 minutes.

Runes

Template:Rune and Template:Rune runes increase ability power.

Name	Type	Tier 1 (Lesser)	Tier 2 (Normal)	Tier 3 (Greater)
Ability Power	Mark	0.33 30 Influence Point	0.46 165 Influence Point	0.59 410 Influence Point
	Seal	0.33 30 Influence Point	0.46 165 Influence Point	0.59 410 Influence Point
	Glyph	0.66 30 Influence Point	0.92 165 Influence Point	1.19 410 Influence Point
	Quintessence	2.75 80 Influence Point	3.85 410 Influence Point	4.95 1025 Influence Point
Ability Power, Scaling (Ability power per level)	Mark	0.06 per level (1.08) 30 Influence Point	0.08 per level (1.44) 165 Influence Point	0.1 per level (1.8) 410 Influence Point
	Seal	0.06 per level (1.08) 30 Influence Point	0.08 per level (1.44) 165 Influence Point	0.1 per level (1.8) 410 Influence Point
	Glyph	0.1 per level (1.8) 30 Influence Point	0.13 per level (2.34) 165 Influence Point	0.17 per level (3.06) 410 Influence Point
	Quintessence	0.24 per level (4.32) 80 Influence Point	0.34 per level (6.12) 410 Influence Point	0.43 per level (7.74) 1025 Influence Point

Trivia

The ability with the largest AP ratio is Annie's Summon: Tibbers, with a maximum AP ratio of 9.8 counting initial cast and the target taking damage from all 45 ticks of tibbers aura damage.
The second and third bounces of Nami's Ebb and Flow scale exponentially, however the low base ratio means it will not beat other spells at normal levels of AP.
Darius, Draven, Garen, Olaf, Riven, Talon, Vayne, and Zed have no abilities or innate effects that scale with ability power.

Aside from Veigar and Thresh, who may obtain theoretically infinite ability power due to the passive effects of Baleful Strike and Damnation respectively, and Galio, whose Runic Skin interacts with a metagame mechanic not intended to be seen in gameplay (bonus magic resistance when disconnected), the highest attainable ability power by a playable champion is 2018.18609429 on Cassiopeia. To reach this amount, she must:
- Have a fully stacked Mejai's Soulstealer, one Seraph's Embrace, and four Rabadon's Deathcaps.
- Be level 18 while having a full rune page of Template:Rune runes.
- Have maximum ranks in the Arcane Mastery, Mental Force, Archmage, and Expanded Mind masteries.
- Possess the Hand of Baron buff.
- Have consumed an Elixir of Sorcery.
- Be affected by Taric's Radiance aura.
- Possess five stacks of the Dragon Slayer buff.
- Have 500 stacks of Cassiopeia's Aspect of the Serpent passive.

This combination will result in

Cassiopeia having 2018.18609429 ability power.

Relevant mathematics:

Cassiopeia's ability power = ( + + + + + + + + ) × ( × × × ) = 2018.18609429

Galio is able to obtain the highest level 1 value of Ability Power in the game (without disconnecting) at more than 121.21725 AP. This is achieved by a combination of the following effects:
- Galio's Runic Skin
- Galio's Base MR 31.25
- Bulwark (30 MR)
- Braum's Stand Behind Me (15 MR or more)
- Mordekaiser's Creeping Death (10 MR)
- Orianna's Command: Protect (10 MR)
- Amplifying Tome (20 AP)
- Full ranks of Arcane Mastery, Mental Force, Archmage, Enchanted Armor, and Resistance masteries (6.89 AP + 5 MR)
- A rune page consisting of entirely flat-value Ability Power runes (36.18 AP)
- 31.25 base + 30 from bulwark + 15 from Braum + 10 from Mordekaiser + 10 from Orianna + 5 from Masteries (+ 0.05 x 70 Bonus MR) = 104.75 MR = 52.375 AP
- (36.18 + 6.89 + 20 + 52.375) x 1.05 = 121.21725

Champion statistics

Offensive	Ability power · Attack damage · Attack speed · Critical strike chance · Critical strike damage · Armor penetration · Magic penetration · Life steal · Omnivamp · Physical vamp · True damage
Defensive	Heal and shield power · Health · Health regeneration · Armor · Magic resistance · Tenacity · Slow resist
Utility	Ability haste · Energy · Energy regeneration · Mana · Mana regeneration Movement speed · Range
Other	Experience · Gold generation

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