Ability power (AP) is a core offensive statistic in League of Legends that primarily increases the power of champion abilities. Unlike attack damage, AP has no baseline effect and must scale through specific ratios.

Core Characteristics:

• Starts at 0 for all champions and doesn't increase with levels
• Stacks additively (1:1)
• Has a gold value of 20 per point
• Primarily scales ability damage and utility effects like slows and shields

AP Champion Types:

1. Pure Ability Casters: Champions who rely almost entirely on abilities (e.g., Syndra, Xerath)
2. Hybrid Scalers: Champions with abilities and attacks that scale with AP (e.g., Kayle, Diana)

Sources of Ability Power:

• Items (e.g., Rabadon's Deathcap, Lich Bane)
• Runes (e.g., Arcane Comet, Dark Harvest)
• Neutral buffs (e.g., Dragon Souls, Baron buff)
• Champion abilities (e.g., Veigar's Phenomenal Evil Power)

Notable Records:

• Maximum achievable AP: 1851.2 (Singed with optimal build)
• Highest AP scaling ability: Annie's Summon Tibbers (615% AP maximum)
• Maximum level 1 AP: 75.6 (with starting gold)

Notable Interactions:

• 21 champions have no AP ratios on their abilities
• AP can scale with other stats through items like Seraph's Embrace
• Some items and abilities can decrease enemy AP

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