So I was browsing my abilities seeing which ones should be placed where on my hotbar since I'm still leveling the Dark Knight, and I notice something. Delirium's INT debuff doesn't stack with Dragon Kick, but Dragon Kick doesn't just apply an INT debuff but a Blunt resist down debuff as well. This causes a slight problem.

The way I see it, the debuff either replaces the Dragon Kick debuff, or it simply doesn't apply itself (I've yet to actually try it out with a MNK in the party), but if the Delirium Debuff replaces the Dragon Kick debuff, then you're effectively reducing the damage that the MNK is doing by 10%. If it doesn't apply itself, then it's effectively a somewhat useless ability in the DRK arsenal.

The only thing going for it is that it is the 3rd part of the highest non-dark arts potency combo.

PowerSlash: 100 -> 220 -> 300
Delirium: 100 -> 250 -> 280

Unfortunately, this damage edge out is a mere 10 potency, and am unsure whether or not this would matter at all in the end-game (Only lv52 currently).