Debuff
Leech
Any Champion that attacks a Champion with Leech debuff heals for 18% of inflicted damage.
What the game's own status effects screen says
In the game data this effect appears as LifeDrainOnDamage10p.
Champions that apply it
63 champions have a skill that applies Leech, according to the effect lines in the game data. This lists who applies it, not how reliably: chance, duration and resistance are on each champion's page.
Amoch the First Satrap
Anaxia the Reborn
Arbais the Stonethorn
Balar the Lost
Bayek
Belz the Reckoner
Bivald of the Thorn
Blood Marchioness Mina
Canoness
Claidna
Corpse Collector
Deacon Armstrong
Deliana
Enda Moonbeam
Foli
Ghomm Yellowhand
Ghoulish Ranger
Ghrush the Mangler
Gomlok Skyhide
Gwyndolin the Silent
Haggibah the Nestmaid
Hotatsu
Ingid Twyst-staff
Inithwe Bloodtwin
Itinerant
Knight-Errant
Kro’khad the Throatripper
Kunoichi
Lady Annabelle
Longsword Torrux
Lorn the Cutter
Ma'Shalled
Michelangelo
Minaya
Narma the Returned
Nekmo Thaar
Old Ghrukkus
Oldbeard
Pestilus
Razelvarg
Rugnor Goldgleam
Runekeeper Dazdurk
Sachi
Scabrius
Seneschal
Shredder
Sniktraak
Teela Goremane
Temptress
Thorn Golem
Toshiro the Bloody
Trumborr
Uugo
Valkanen
Vallaryn the Equalizer
Versulf the Grim
Vildrax
Vlad the Nightborn
Vogoth
Wythir the Crowned
Xalgaze Fangwall
Yannica
Zinogre Blademaster
The description is the game's own text. It has not been tested in battle here, and the game's wording can be loose (for example about numbers that differ between versions of an effect). See Data quality for what has and has not been checked. Found a mistake? Use "Report a problem" at the bottom of the page.