Why was it changed again?Does no one remember that an ADC (Vayne in particular COUGH) could build those 2 items and deal tons of damage without building ad and also making it difficult to itemize against?At one point it was so incredibly overpowered that even rengar built those 2 items together
EDIT: It seems that only the effects stack together. It's still stupidly strong.
the damage doesn't stack, the effects do, which is equally stupid, tbh, i thought we wanted decision making in ADC builds
Because ADC's aren't allowed to be weaker than any class at any point in the game.
RIot should just give 
the 
treatment.
You cannot buy another if you already own one.
Almighty.
Why was it changed again?Does no one remember that an ADC (Vayne in particular COUGH) could build those 2 items and deal tons of damage without building ad and also making it difficult to itemize against?At one point it was so incredibly overpowered that even rengar built those 2 items together
EDIT: It seems that only the effects stack together. It's still stupidly strong.
If I recall correctly, the effects of each had already stacked. (But not the damage) The issue is that the energize portion of the itemization wasn't unique. (Or part of a passive with a different name.) So stacking Energize items cause all items to energize faster.
Were we fell into that trap again is when Riot decided to give RFC a 25% increase in Energize speed. So we have jumped back to where those items synergize again.
But in my opinion, that not even the worse problem. Building both of those items should come with the opportunity cost of a more defensive item like a LS item. But when we combined this with the Warlords keystone, we don't seem to have any shortage of sustain, so we really never need to build LS.
I recall the main reason why this keeps getting changed was the fact that Runaan's was completely abused at the time. And this seems to be a reoccurring problem with ADC itemization becoming polarized. And I believe this has something to do with the fact that ADC's really only build one thing, Damage. There's no diversity in their itemization because it's all about what optimizes their damage.
They dont stack.
It doesn't stack, however, there is more synergie between them(and warlords) as befor. SS has quite a bit more base damage now(100 more damagr with IE-crit) while RFC increase the rate of energized attacks, so compared to befor the last crit item changes, Both to gether give higher damage procs at a higher rate, and the higher rate also affects the warlords healing.
But evem without the stacking, SS is just rather busted and somwwhat flawed in it's design, a sustained dps item that at the same time offers lot's of upfront burst. Cureently, it gives twice as much raw damage on your first hit than a BT or DD would give, while actually beeing a AS/Crit item.... ADC itemisation, especial crit, still is a big issue in lol imo, and one of the major reasons for a lack of diversity.
Nothing was changed "again". During Season 6 the dmg stacking was removed so no one longer nought them together (cause it sounded stupid/not worth). The effects still stacked but players got to knew how rly strong runans got with the added crit.
What they changed is runans aoe and singletargetdmg and giving rapidfire the effect to stack itself, warlords and shiv faster, so players see to have a BETTER reason to buy these two together again.
what is so wrong for 2 items having a good synergy with each other? Liandrys/Rylais, Trinity/Steraks or Trinity/Botrk work well together too.
