Riven's Power spike
So, in Leauge of legends we have different champions with different stats, kits, and other things. If you use a champion like Fizz, you get wrecked pre 6 and you still need some power, in fact you get your max power spike at level 9 (E Maxed) Riven's power spike is something that a lot of players hate, she can possibily kill you with a rotation of 2 spells and an ignite. At level 6, her kill pressure is even higher thanks to bonus AD from ult and % Damage. My suggestions are nerfing her base damage, because she has a high base damage with high scaling.