Debuff
Decrease RES
Decrease RES debuff decreases the Champion's Battle RES by 25% or 50%.
What the game's own status effects screen says
In the game data this effect appears as DecreaseResistance50.
Champions that apply it
21 champions have a skill that applies Decrease RES, 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.
Admiral Blacktusk
Amoch the First Satrap
Androc the Glorious
Balar the Lost
Bayek
Deliana
Greathoof Loriaca
Klaazag Keyhulk
Nari the Lucky
Night Queen Krixia
Signy of Highshield
Skeletor
Starsage Galathir
Sulfuryion
Supreme Kael
Tatsu
The Scarecrow
Theresc
Valkanen
Xalgaze Fangwall
Yoshi the Drunkard
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.