does it do anything? Like, she's an ad caster so does it actually effect her abilities?
as a general rule, spell damage (i.e., the damage your abilities deal, be it physical or magical) does not benefit from life steal. so to answer your second question: no, it doesn't.
personally i wouldn't pick it up on riven—as mentioned by a few others in this thread, items like bloodthirster and ravenous hydra are much better for riven since they give more attack damage (which riven really, really likes).
BotRK on riven?
personally i wouldn't pick it up on riven—as mentioned by a few others in this thread, items like bloodthirster and ravenous hydra are much better for riven since they give more attack damage (which riven really, really likes).