Cassiopeia

Arena changes

• W: Cooldown changed to 28 to 20 seconds.
• E: Poisoned damage AP ratio changed to 40% AP.
• E: Poisoned heal AP ratio changed to 7 to 9% AP.
• R: Base damage changed to 100 to 250 3.
• R: AP ratio changed to 40% AP.²

• Adapt, Energized and Ethereal Weapon are paired with Runecarver, Fulmination, Statikk Shiv, Nashor's Tooth, Blade of the Ruined King and Lucidity boots in a Cassiopeia build.³
• Gamblers Blade works well on Cassiopeia, especially with Purist Caster.⁴
• Ethereal Weapon can apply its effect with each Cassiopeia E, and Runecarver can proc with her frequently cast abilities.⁵

• With Cassiopeia as the Guest of Honor, boots items cannot be purchased, and any already purchased are automatically resold in the shop; Cassiopeia immediately gains 2250.⁶ Patch unknown
• Magic Missile is a good level 1 gold augment for Cassiopeia.⁷
• Ethereal Weapon pairs with Divine Sunderer for Cassiopeia.⁸

• Cassiopeia's W cooldown changed to 28 to 20 seconds.² Patch unknown
• Cassiopeia's E poisoned damage AP ratio changed to 40% AP, and her E poisoned heal AP ratio changed to 7 to 9% AP.² Patch unknown
• Cassiopeia's R base damage changed to 100 to 250 3, and her R AP ratio changed to 40% AP.² Patch unknown

Earlier formats

• Since patch 25.07, Cassiopeia can no longer buy boots, and the boots round becomes a full item round; previously purchased boots sell for full value.⁹ 8x2 duos
• Nilah can feel bad to play into Cassiopeia's W.¹⁰ 8x2 duos
• With Cassiopeia as Guest of Honor, Heartsteel can be a good item.¹¹ 8x2 duos
• With Cassiopeia as Guest of Honor, an extra round with gold can help buy more anvils and get Shardholder faster.¹² 8x2 duos
• Issuing a movement command did not cancel Cassiopeia's E, which made kiting easier.¹³ 8x2 duos
• Jeweled Gauntlet was a best-in-slot augment for Cassiopeia.¹⁴ 8x2 duos