Hey everyone I've never come across a 100% sure answer to the question: "Do buffs/debuffs stack?" What I THOUGHT was how it works So far, I thought different buffs/debuffs only apply at the same time if they affect different stats (so two different DEF debuffs wouldn't stack, while a VIT debuff & a DEF debuff would). However... Test setup I went to NR with a Rogue and a Creator. The Rogue had access to the Raven skill 'Claw Bite,' which debuffs DEF & MDEF. The Creator had access to the debuff 'Acid Splash,' which debuffs DEF. The punching bag (yours truly) kept an eye on daily login bonuses so data wasn't confounded by that variable. We made screenshots of 5 situations: Normal stats (no buffs/debuffs involved) Stats when debuffed by Claw Bite Stats when debuffed by Acid Splash Stats when debuffed by Claw Bite first, then immediately a Acid Splash debuff "on top of it." Stats when debuffed by Acid Splash first, then immediately a Claw Bite debuff "on top of it." Test results Normal status screen Status screen with Claw Bite debuff affliction Status screen with Acid Splash debuff affliction Status screen with Claw Bite -> Acid Splash debuff afflictions Status screen with Acid Splash -> Claw Bite debuff afflictions Conclusions In this case, the debuffs didn't exactly stack; one of the buffs didn't retain it's complete effect on the target. They were combined somehow. In this case, the order in which the target was afflicted with debuffs had an influence on the total amount of debuffs. [Insert which was higher]. Further research is required to investigate these mechanics for different skill combinations, for different branches of skills. Don't jump to more conclusions! We don't know IF & HOW this applies to other debuffs. We don't know IF & HOW this applies to other branches of the same debuff skills. This is too little data to make a formula. I might be able to pull one out of a high hat if I crunch some numbers, but it's too soon to ensure that such a formula is accurate. EDIT: corrected name of Creator debuff skill. Credits to @~Rayleigh & @MarMar for pointing out & providing the correct information.