So about fervor...
Can it please stop stacking on minions? It's broken as hell in lane right now w/ attack speed/aa reset champs. It's supposed to have to ramp up, and be balanced around that in theory I think. When you can just stack it to 10 on minions and keep it up w/ ability use it is too strong in early trades. Level 2-3 10 stack fervor and corrupting potion trades are broken as hell right now, but would probably be fairly balanced if you didn't start with 10 stacks and a strong bonus on every auto.
very weak is solo lane for various reasons, usually you will take AD marks (or Mpen) armor yellows blah blah blah. Lets focus on AD marks. 9 marks at .95 gives him 8.55 AD. This gives his Q at Rank 5 an additional 33 Dmg and his E and additional 5 dmg. Thats nothing. At level 5 Fervor gives him 30 AA, which he can easily keep up due to attacking and casting. By itself you deal overall more damage than his runes. Now what you can do is go all armor making yourself a defensive threat while still being able to deal significant damage when someone tries to jump on you.