Please buff blackfire torch.
Not asking for an item that becomes what Deathfire Grasp was to SR, not something everyone will always get. But in its current state, it just doesn't feel like it fulfills its intended role. Maybe something like this would work:
Max damage "6% of someone's current health over 3 seconds, half for DoTs/AoE"
Min damage "2.5% of someone's max health over 3 seconds, half for DoTs/AoE"
The purpose is to chip away tanky people right? Well right now the only people I've seen it work on is Singed and Swain. For pretty much anyone else you get better/equal damage by getting heavier AP items.
So it's pretty much a "who's on your team" instead of "who's on theirs."
Maybe it's perfectly fine and other people have seen it do just what it's supposed to do, I don't know. Just, from my experience, its damage is so negligible it hasn't fulfilled the role I figured it would. Not for its cost anyways.