What are custom ability icons in Dota 2?

Some cosmetics replace the icons of a hero's abilities in the in-game HUD — usually the weapon or head piece of a set, an Immortal, or an Arcana. The game files declare them as ability_icon asset modifiers; this page is generated from that data, not from screenshots.

Which hero has the most custom ability icons?

Pudge, with 36 custom icons across 16 items, followed by Earthshaker (35) and Skywrath Mage (19).

Why do some icons show the default art with a ✦ marker?

Valve only publishes part of the custom icon art outside the game client (175 of the icons previewed on this page). Where the public CDN has no texture, the default ability icon is shown with a ✦ marker so you still know the ability gets custom art in-game.

Do custom ability icons change gameplay?

No. Ability icons, spell effects, animations and sounds from cosmetics are purely visual; ability values are identical for every player.

In-game changes

Dota 2 Custom Ability Icons

577 Dota 2 cosmetics across 120 heroes replace at least one ability icon in the HUD — 858 custom spell icons in total. By rarity that is 419 Immortals, 40 Rares, 29 Uncommons; 208 of the carriers are pieces of a set. 377 items also change spell effects. Pudge leads with 36 custom icons across 16 items. Pick a hero to see every re-skinned ability and which item it is bound to.

By hero

Questions

What are custom ability icons in Dota 2?: Some cosmetics replace the icons of a hero's abilities in the in-game HUD — usually the weapon or head piece of a set, an Immortal, or an Arcana. The game files declare them as ability_icon asset modifiers; this page is generated from that data, not from screenshots.
Which hero has the most custom ability icons?: Pudge, with 36 custom icons across 16 items, followed by Earthshaker (35) and Skywrath Mage (19).
Why do some icons show the default art with a ✦ marker?: Valve only publishes part of the custom icon art outside the game client (175 of the icons previewed on this page). Where the public CDN has no texture, the default ability icon is shown with a ✦ marker so you still know the ability gets custom art in-game.
Do custom ability icons change gameplay?: No. Ability icons, spell effects, animations and sounds from cosmetics are purely visual; ability values are identical for every player.