More specifically:
"Damage-over-time and multi-target spells no longer have reduced effect"

"These changes help clarify the item’s role as well as make its unique playstyle more accessible for additional casters."

Need I say more?

Yes you do.

I made this thread because in the last patch they made several changes to Liandry's Torment, because according to them it was essentially a niche item and they wanted it to be "more accessible for additional casters".

I am buy no means asking for it's base % damage to be increased (as done with Liandry's) but it would be a nice change given to Liandry's counter part, the Blackfire Torch which also fills a similar niche on 3v3/Dom and also upgrades from HG. (and as such is why I did not post in GD)

What I'm asking for to change the Blackfire Torch so AoE spells also get the same % health burn as single-target spells just like what they recently did to Liandry's % health burn.

Patch notes can be found here:
http://na.leagueoflegends.com/news/patch-302-notes