fermented hops should damage 25% of 35% of the creatures maximum health when debuffed with blighted (assuming no realm and traits modification), but that is not the case
The damage still has to make it’s way past defense, I think, and that might be intentional.
So unfortunately as to the low or no damage - not sure if this is or is not a bug - more representative of the indirect damage from blight needing tuning? or maybe that spell in particular.
i tested that on a lv 1 creature with my lv 10k+, so i’d say it is a bug
the damage source is the level 1s creatures health, and the damage sink is the level 1 creatures defense, so your level does not come into it, I believe