Instant effect
Decrease Cooldown
Decrease Cooldown is the game's own name for this effect on the battle screen. The game gives no separate description for it.
Champions with it
100 champions have a skill with a Decrease Cooldown effect, according to the effect lines in the game data. This lists who has it and on which skill, not how strong it is or how often it happens: values and chances are on each champion's page.
Admiral Blacktusk Unnamed skill
Alice the Wanderer Tick Tock [P]
Altan Fiery Rebirth [P]
Anaxia the Reborn Frenzied Execution
Arne the White White-Hot Rage
Ashwalker Great Hammer
Astralith Judgement (this champion)
Authoratrix Lamasu Icon of Domination
Belletar Mage-slayer Critical Juncture [P]; Fume Ax
Brewguard Jeroboam Stout Smash
Candraphon Butcher's Glee
Cardiel Unnamed skill
Chaagur Heart Stopper
Chonoru Lay Bare
Cillian the Lucky Head Ringer
Countess Lix Time Dilation (all allies)
Danag Skullreap Battle Flow
Dawncaller Sabitha Rising Fate [P]
Djamarsa Phasing [P]
Donatello Shellshocker (all allies)
Dune Lord Greggor Bestial Yell (all allies)
Emic Trunkheart Vinequake (all allies)
First Ax Tuskkor Hatchet Barrage
Fjorad Wolfheart Great Captain (all allies); Rimecleave
Fyna, Blade of Aravia You Will Not Falter!
Galleus Bloodcrest Unholy Experiment [P]
Genzin Fated Vengeance
Geomancer Creeping Petrify
Godseeker Aniri Rise of Glory
Golden Reaper Harvest of Blood
Grand Oak Padraig Snakeroot
Gretel Hagbane Shadowseeker Bolts
Hurndig Lethal Lust
Incubus Demon Fangs
Iudex Artor Sentenced to Life [P]
Jintoro Blood Freeze
Karato Foxhunter Bedevil; Stoicism [P]
King Garog Hack to Bits
Knight-Errant Mordhau
Konstantin the Dayborn Quietude
Lady of Ireth Rhythmic Strength (all allies)
Locwain Focused Force
Maranix Death's Collector [P]
Masked Fearmonger Nightmare
Miyoko, Flower of Yakai Two Steps Ahead [P] (all allies)
Mountain King Regal Force
Nekhret the Great Unsleeping Aegis [P]
Niamhe, Spear of Nyresa Cerulean Guard (all allies)
Night Queen Krixia Nightpurge (all allies)
Ninja Cyan Slash
Nobel Dismay; Harbinger
Nogoryo Faster Than The Eye
Osgrun the Defiler To Death, Unsurrendered (all allies)
Pain Keeper Combat Tactics (all allies)
Pheidi Tealcrest Sky Mirage (all allies)
Praeva the Slitherer Seed of Corruption
Prince Kymar Seal of Magic (all allies)
Queen Eva Energy Drain
Queen of Hearts Queenly Command (this champion)
Quintus the Triumphant Crowd Favorite; Strip Away
Raglin Miracle
Ramantu Drakesblood Psychic Overload (all allies)
Renegade Sacrificial Ritual (all allies)
Rhaia the Mourned Legacy Of Despair
Ripperfist Bloody Mess [P] (this champion)
Roxam Flicker Step
Rugnor Goldgleam Dire Grudge [P]
Saito Enduring Warrior
Septimus Behead
Siegfrund the Nephilim Seraphic Wave
Skartorsis Command (all allies)
Slicer Finishing Blow
Solanar the Gleaming Unfettered Radiance
Supreme Elhain Let None Live
Swarmspeaker Zyclic Insectoid Feast
Tetsuya the Deliverer Preternatural Tactician
The Cowardly Lion True Courage [P]
The Incarnate Crisis Response [P] (all allies)
The Scarecrow Smart Thinking (all allies)
The Tin Woodman Unnamed skill (this champion); Fell It Now! (this champion)
Thea the Tomb Angel Befoulment (this champion)
Thralia, She Who Stands Crystalline Fury; Stand With Me!
Timit the Fool Back With A Bang
Tormin the Cold Blizzard Rage (all allies)
Tribune Herakletes Battle Resurrection
Truath Transmute Pain [P]
Turvold Juggernaut
Ultan of the Shell Metabolism [P]
Vallaryn the Equalizer My True Purpose [P]
Venalicia Thrallmother Mother Knows Best
Vitrius the Anointed Inexorable [P]
Vott Head-lopper One Clean Cut
Vulkanos Fumor Surging Demonfyre [P]
Walking Tomb Dreng Death's Balance
White Dryad Nia Riotous Revival
Wight Queen Ankora Necrobolt (all allies); Rise, My Love
Xena: Warrior Princess Whip of Destiny
Xiloco the Encrusted Bejeweled Club; Primeval Secret
Yumeko Dance of Time (all allies)
Zii Ixchi Assassin of Kings [P]
Taken from the game data and not tested in battle here. See Data quality.