Luden's Echo

Stats

Values as the League of Legends Wiki's item data lists them, for every mode; the data doesn't state their units.

Effects

• Echo (unique): Gain 6 Echo stacks. Dealing ability damage to an enemy consumes all Echo stacks to deal 75 (+ 5% AP) bonus magic damage to them and, for each stack consumed beyond the first, an additional enemy within cr 600 units of them, firing an orb at each secondary target that impacts after 0.5 to deal the damage. If the number of additional targets fired at is less than the number of stacks consumed,deal an additional 75*0.2 to 75*5*0.2 for 5 (+ 5*0.2 to 5*5*0.2 for 5 AP) magic damage to the primary target, for a total of (75*0.2)+75 to (75*5*0.2)+75 for 5 (+ (5*0.2)+5 to (5*5*0.2)+5 for 5 AP)³

Arena changes

• Ability power changed to 85.
• Ability haste changed to 25.
• Echo base damage changed to 80.
• Echo secondary damage changed to 35% of primary damage.
• Echo cooldown changed to 6 seconds.
• New Effect: Echo now scales with 6% bonus AD.⁴

Earlier formats

• With Apex Inventor, Luden’s cooldown is reduced to 2 seconds.⁵ 8x2 duos
• Luden’s can proc repeatedly with low-cooldown spells or area-of-effect auras.⁵ 8x2 duos
• Void Grubs can activate Luden’s.⁶ 8x2 duos
• With Ethereal Weapon, Orianna’s W applies Luden’s.⁷ 8x2 duos
• Luden’s can proc frequently with Apex Inventor on a Lux build using Slow Cooker and Heartsteel.⁸ 8x2 duos