The proper riven nerf
change her shield to be similar to yasuos
it only triggers of enemy champion damage
example when riven used her E she has 2 seconds of being able to gain the shield IF she takes damage from an enemy champion
this means no more blocking a tower shot after a trade under the enemy tower or minion damage after a trade
it also means worse jungle sustain
her damage CC mobility and in the moment trades remain the same, but she isnt able to tower dive or tank minions/monsters as effectively
that 1 nerf will make her much more tolerable for having less effective hp when fighting non champions or after trades (no more free tower shot blocks unless also getting hit by the enemy champion)